I haven’t put a carbine reload on a timer in a few years so I’m not sure.
It might not be the fastest way, but for me I’ll give up the maybe .2 seconds to only practice one type of reload that prevents me from having a mag fall out versus having a different method for bolt foward vs bolt locked back.
Plus I come from AK world where good reloads aren’t blazing fast anyways. It felt natural to emphasize reliability of a technique ove speed.