This is what I mean by different people having different sensitivity. I fully believe that this is true for you and many others, but it's not true for me.

So you believe you have more acute sense of temperature and pressure? There is an element of meditation involved

I can definitely notice the water, yes. Even regardless of temperature and pressure, there is no way to make absolutely no movements (unless you're dead, and even then ...) which means the water will be in motion, which is very obviously noticeable on body hair.

> There is an element of meditation involved

Sure, but this is a different statement - it's more like saying "yes, the sensation is noticeable, but the point is to learn to ignore it" which is different from "there is no sensation".

My point is everyone notices that to some degree, unless they're dead like you pointed out. Having an expectation on absolute 0 sensation is unrealistic. The purpose of a deprivation tank in this scenario is to reduce/deny as much sensory input as possible, leaving just mental stimulation, aka mediation.