Well for action RPG's, there's Nier Automata, Devil May Cry, Phantasy Star Online 2, Kingdom Hearts, Warframe, Mount&Blade, Sekiro, Souls-likes....
For melee combat I'd say it's the closest to Kingdom Hearts
In general, I've drawn a lot of inspo from Armored Core and Phantasy Star Online 2
At the moment a few buttons are somewhat redundant:
>In melee mode, Punch and Kick do the same thing as Fire1 and Fire2
>with guns out, Fire2 just points your weapon at the current target, and zooms while manual aiming
What I'm least satisfied with for M&K is Block being on Ctrl, I suppose I could swap it with Fire2 to get it on the mouse (it's kind of leftover from when manual aim was always on while guns were out)