But whatever tools we use to aid our survival or make things easier are not necessary for survival and Neanderthals from what we assume to know about them could have easily survived and thrived just as they were. You are assuming that for some reason evolution wanted to create a species to use shovels, rifles and build elaborate shelters. That is just comical.
Now you give me compelling evidence that humans NEEDED to evolve from whatever they supposedly were before. Do you honestly think a brain can evolve to something more sophisticated because of a natural obstacle or because the organism needs to sit its ass on a couch somewhere? Sounds like BS to me.
We hear about organisms evolving because of need or adaptation, well then you tell me what the need for humans to evolve from whatever you think they were before was. The logical and obvious answer to me is that there was none. Sorry Charlie.
The way you use "need" seems to me to be the issue. Humans did not need to evolve in some absolute sense, nor did intelligence, nor did birds' wings.
Let's say all the food is high up in trees and I aims to gets it. Presumably, if that is my only food and my species is surviving, I must be getting it somehow (perhaps we live on the food that happens by chance to fall to the ground). However we are eating, we are eating and there is no "need." But suppose the food that falls is insufficient to sustain our whole population. Now what happens? Some of them starve, and the ones that starve are disproportionately likely to be the ones who had some comparative disadvantage in getting that food. (Why? it could be any reason. Maybe they have poor eyesight and can't see the food as it falls or in the distance while others can. Perhaps they are slow and can't get to the falling food before it's scavenged. Perhaps they are weak and others beat them up and take the food. It could be any trait that puts them in the group that starves.) Those traits that disproportionately led to the starvation of certain members of the first few generations start to become less and less prevalent in the population as a whole. The population's characteristics change.
Conversely, the ones that tend to remain are the ones that have a comparative advantage. Suppose many generations in, one animal as a result of a random mutation develops the ability to climb, or slightly better senses to see/hear/small the food, or better footspeed, or greater strength, or any other trait that gives him a slight or great advantage over his peers. Assuming the group as a whole is still breeding in numbers that lead to starvation, his trait is disproportionately likely to allow him to survive. He is disproportionately likely to have offspring and to pass that trait on. In succeeding generations, that those with the trait are more likely to succeed than those without and so the trait becomes more prevalent in the population as a whole. Again the population's characteristics change.
"Speciation" is the cumulative effect of all of these changes over the course of many generations. Any one individual change is likely not enough to result in a new species, but a dozen, a hundred, a thousand? At some point the new population is so different that a clear demarcation across time can be made.
As for humans and intelligence, we developed it because it was helpful in our survival on balance. It comes at a high cost given the many calories it takes to sustain the brain and the high levels of protein required. What must have happened, under the natural selection model, is that (i) ancient pre-humans faced challenges, (ii) some pre-human had a random mutation that led to greater intelligence, (iii) he and his descendants with the trait were disproportionately likely to overcome the hurdles to reproduction that they faces, and so the trait thrived. If those pre-humans had (randomly) developed wings, or a better immune system, or the ability to hold one's breath for three straight hours *and* those traits helped them survive better than the the rest of their competitors, then we'd have those traits instead, but that is not how it happened.
Let's say (again) that the food is very high in the trees and someone develops wings. Let's also say that another individual, without wings, develops the ability to throw rocks with pin point accuracy. Suppose that the rocks can be used to knock the food out of the trees (and, for arguments sake, let's suppose they can't be used to kill our flying competitors). What happens in that case?
Nature has several paths it might take (likely even more than I am imagining). First, it might be that wings are expensive...it takes a lot of energy to fly your whole body up into the trees, and comparatively little to throw a rock. It might be that rock throwing is superior in efficiency to wings and that the rock throwers will out-compete the bird-men. Second, it might be that the wings are more efficient (perhaps the fliers gather more food per trip than the rock throwers, or catch the rock throwers food as it falls). Third, two separate populations might develop, one living in one area and the other in a second area, eventually becoming two separate species with different strategies for food gathering.
In either case, they neither needed to develop the ability to fly nor the ability to throw rocks, those traits appeared randomly and happened to be beneficial in light of the environmental contstraint that the species faced.