The layout was decided by someone who's never watched you work
Which means every time you reach, you're reaching around a decision somebody else made years ago in a room you've never been in.
Sometimes the gap is small and you adapt in a week. Sometimes you spend two years reaching across your body for your strippers because that's where the pouch put them, and you never quite stop noticing.
The reason guys are walking away isn't that fixed belts are badly made — there's a lot of well made ones. It's that the one thing they can't do is the one thing that matters most: let you put your most-used tool exactly where your hand already goes, on your dominant side, off the hip that gets pinned against a ladder rail.
Modular carry doesn't come with an opinion about that. You set it, you work it, you move it when you're wrong. You will be wrong at first — everybody is. The difference is whether being wrong is fixable.