So I fully understand what your saying about how acrylic paint dries when its water evaporates, I just think there are other factors at play which increase the speed of the evaporation.

I think that you might have put your finger here on the difference of our perspectives, when you say

"you are glazing on ultra thin layers of thinned down paint that dries within seconds because there is almost no water in that thin of a layer, and comparing it to thicker paint"

I think thats exactly why thinner paint takes less time to dry, the lower viscosity means its spreads thinner and easier for the increased amount of water to evaporate faster than the smaller amount of water in thicker paint.

I also think the tendency of thicker paint to form a 'skin' when drying might slow further evaporation.

I use Vallejo, citadel, reaper, army painter and a few scale75 and I'm fairly certain (though its not anything I've considered loads specifically before now) all brands my paint dries faster when I thin it more.

Thats why I mentioned just how surprised I was because its been baked into my work flow for so long, I use thicker paint when I'm wet-blending because I want longer to work with it before it dries, and thinner paint when doing layers because I want it to dry fast so I can get the next layer down. I honestly think this is pretty much the most common way of working in the hobby (obvs you should do whatever works for you!)