I'm well aware of which forum I'm in so I'll be brief and respectful

part of the required kit for a fundamentals course I have read many times is a harness constructed of 2 1/2 inch webbing in a continuous piece, ergo if you want to dive DIR then you have no choice.
I have done hundreds of dives with full breaks, with pinch clips and with the AP valve press clips and never had a problem, I now dive with a continuous one piece harness with an AP clip that when opened gives an extra 9 inch to make doffing it easier.
I use the same configuration for all my diving and it does make life easier, but when diving from a RIB it really comes into it's own. AFAIC there is no fun in being whacked on the noggin when trying to flip or swim out of a 'toit' one piece rig.
Safe diving,
Steve