What do you think predictive means?
It is entirely de facto.
My model predicts that, if I power up a magnet to X volts, I will get a bright spot on a fluorescent screen of Y deflection.
Yes, but you cannot predict before you conduct experiments, and you conduct experiments before you create models, only after you conduct experiments you create models of what you directly observed in experiments-predictive models are already known because of experience with previous experiments and previous direct observations and previous experiences with every day life and with previous experience wit experiments and what exactly was directly observed and proved in these experiments.
Plus the greatest mistake in QM is exactly this mentioned above; you create models on what you experience in this macro-level world, not on quantum level, that's why QM is all wrong.
It doesn't matter whether or not those are "really" negatively-charged electrons; the simple fact is that I can declare with supreme confidence over an arbitrarily large number of voltages, through an arbitrarily large number of tests, where the spot on the screen will occur. And lo! it does.
Notice there is NOTHING in there about proving anything.
First of all, what you described is actually experiment, not the model; again misinterpretation of words models and experiments.
The key problem is that its results always adapt to models that are assumed to be correct and predictive, so the explanations and interpretations of experiments like these simply adapt to what models "predict", not to what experiments actually, exactly show and prove in the first place.
But the problem and your greatest error (and not just your error, it's the greatest error of all mainstream, religious scientists) here is you cannot possibly know what that spot on that screen is all about and what exactly it shows and what exactly it proves-it's like blind man to find out what is the object he touches that he has never experienced before-without direct observations you cannot do anything at all, just create fiction without any basis to start with.
And this, what you just described above, 100% proves all of my points here on this thread; don't model something you can never test-because there is no conclusion you can base on anything when you see those spots on the screens, this what computer shows, but you can never know what it is or how does it look like, you only see what computer shows and how computer shows it; the fact is you cannot know what it is in any way, you can only know it's voltage and those spots on screens are simply prints like lightning leaves on the ground, after lightning hits something-the tree for example-the same as for spots on the screen-the only real thing that has actually been proven is what happens when voltages hit the solid/hard surface, they do not prove the existence of electrons in any way, not even the slightest; they are simply directly observable effects of voltages when they hit hard/solid surface-facts-this is exactly the only things that you can actually conclude based on actual evidences, not based on models-again another misinterpretation-facts.
With my model, I make a prediction. That prediction comes true. Every time. That's science.
EVERYTHING else you say after that first sentence is misguided.
Just as I explained above, you did not predict the existence of electrons or the existence of anything else-again this is not science, pure science is not to create the model of electrons that do not exist and they are impossible to test with, but to offer the real and correct explanation on what truly experiments show and prove-and you cannot model electrons since the experiments do not prove their existence, since their existences can never be tested, and it cannot be even assumed and concluded logically to exist in the first place-facts.
You have just shown how you scientists misguide the entire civilization by saying our models predicted that and/or our experiments proved that and similar.
The biggest scam in entire history-based on lies, misconceptions and misinterpretation that all scientists so strongly believe without a shred of any real/true evidence at all-this is called religion-since they do not accept anything else that beats their hypotheses, models and their misinterpretations on what they experiment with.
This is why there is no surprise that science is stuck with their models in eternal loop, since there is literally almost nothing they have proved to exist in those models, plus everything what models offer to explain and "prove" to exist is also 100% untestable and 100% unprovable.