Doing skills during or at the end of a dive is, to my mind, is either a good thing to do or, possibly, going too far depending on what you are doing. After all there is the adage "if it isn't broke then don't fix it'.

Obviously the learning of muscle memory skills so that finding and doing things becomes second nature is crucial in the event of an emergency. As far as removing kit under water well, OK, but only in the right circumstances. Personally, I would prefer to keep that to confined water sessions (eg pool night).

Personally, I dive with twin 12s mounted on a stainless steel back plate and with all the paraphernalia I take on a dive + usually being into some deco then I would consider in water de-kitting to be an unwise thing to practice when diving off a charter boat and drifting in the current under a DSMB. I do always make a reach for my manifold knobs and isolator and have a pat round to make sure I can find everything on every dive but that is about as far as I go.

In short, it is a very good thing to do but not every dive is right to do some skills practices?