Another issue with chain pulling in FFXIV compared to WoW and similiar games is that mob movement is inconsistent. Some mobs move faster than others, some stand still to cast something, the differently sized hitboxes cause some weird wiggling around from mobs even on the run so that makes targeting and aoeing on the run even more difficult.
The way mobs move, aoes and cooldowns are designed just heavily favours pulling everything and than standing as still as possible to kill it. It's a very clear "move to pull, stand still to dps".

Stop and go pulls might be muscle memory from WoW and similiar games but sometimes it's simply poor gameplay because they can't decide beforehand what they want. Once they decided on a pull size they need to stick with it. Even if they feel the current pull is to small, kill it and pull bigger next time. But adjusting pull size while the current pull still gets aoed is a really, really bad idea.