Are you using shift modifiers or anything at all? I play mouse/kb and don't even have a gaming mouse, and there are only really a few classes where I have trouble reasonably keybinding everything and needing to click. Even then it's mostly tanks and healers, which I don't play as often as dps, so I really just haven't sat down and taken the time to really organize my hotbars very well for those classes. I bind and use 1-6 and f1-f5, RTYZXFG, and three mouse buttons (I do have two side buttons, and the middle button to bind), and then I have shift 1-3 set up, and that pretty much covers me on most of the classes I care about.
Ofc I do have carpal tunnel and other issues

so I'm usually playing with a wrist brace on and can't reach as far as some others could. I could probably have a better more usable setup if I didn't already have hand and wrist problems.
I wouldn't complain if they condensed some things where reasonable, maybe combined some abilities to one button where it makes sense, but I wouldn't actually say FF is too much worse than WoW in terms of hotbar usability. It at least has a better base UI (for hotbars, if literally nothing else) even if there are definitely some mods in WoW that give much more flexibility and a generally better experience overall.