Because it is required. Name one scientific theory that cannot be proved in the lab...
Science cannot prove the existence of dark matter and dark energy in the lab. These are inferred from observations far away in the universe but it cannot be seen in the lab. The paradox is connected to the imagination seeing what it expects to see; filters of the mind. The lack of lab proof should at least raise a yellow flag, but often does not. This is due to the politics used to create peer pressure to allow an emperors new clothes affect to appear. The crowd will go along rather than be singled out with contempt for being someone who can't see the clothes on the naked emperor.
Evolution that does not ignore water:
The next thing I would like to discuss is the idea of cooperative hydrogen bonding. Cooperative hydrogen bonding is where more than one hydrogen bond can work as team forming a hydrogen bonding analogy to electron resonance; benzene. One lab observation about cooperative hydrogen bonding is as more and more hydrogen are added to the cooperative, all the bonds of the cooperative get stronger. This observation implies of a type of sharing that is spreading out and stabilizing the entire cooperative.
Another observation about hydrogen bonding cooperatives is the first bond in the cooperative, that is broken, is the strongest link, no matter which bond one tries to break first. The cooperative sort of focuses all its strength at the point of breech, making the breech hydrogen the defender of the cooperative; so to speak. After the first hydrogen bond is broken, the bond strength for the remaining hydrogen goes down quickly.
From this one could infer, based on the hydrogen bonding binary switch, cooperative hydrogen bonding requires the covalent side of the binary switch, to allow the needed electron sharing. In terms of the DNA, because the DNA forms hydrogen bonding along its axis, cooperative hydrogen bonding can occur. Based on the degree of cooperation along the axis, one can define binary memory along the axis. The double helix of water that intertwines the double helix of the DNA can define liquid memory via cooperatives.
Cooperative hydrogen bonding in water are very important to life because the covalent aspect of the binary has the lowest enthalpy, lowest entropy, but the highest volume thats exerts the most pressure. Where there is a cooperative these potentials become multiplied locally; volume of fixed memory.
ATP, which is the energy molecule of life, impacts both the organics and the water. The organic aspect is well documented and will not be discussed. The ATP impacts local water cooperatives by acting as a bolt cutter. The ATP needs to chemically bind water. This forward reaction is strong enough to breech the cooperative. The decline in cooperative binding energy, after the hydrogen is breeched, shifts the binary back toward the polar state of hydrogen bonding. This difference in enthalpy, entropy, volume and pressure, help drive the reaction. After the reaction, the water resets the cooperative. Because of the simple binary changes between two versions of hydrogen bonding, reset can occur quickly.
As a visual, picture a steel chain composed of links. If we place the chain under stress, all the links feel the same force being exerted as the chain expands and stretches. The chain is taunt and feels almost solid; low entropy pseudo-solid. If we take a bolt cutter and but any link in the chain, the entire chain will snaps with ferocious rebound, as all the links gain fluid motion; entropy increases. The organics of life provide opportunities for stable cooperatives; potential stored in memory.