Are we talking about a modern Xbox/PS4? Modern console controllers may not have the number of individual keys/buttons of KM/M but they aren't exactly lacking in buttons.
Last time I checked, the number was 16, assuming you count the D-pad as 4 keys that require taking one thumb off the stick. And yes, some fighting games did okay with only 4, though the better ones had 5 or 6. But if I wanted that then I wouldn't be waiting for CP2077 in the first place; I'd be waiting for
Soulcaliber VI. Now, if they could turn that 16 into 20 then I'd have a different opinion, but given how many console games fail at non-combat controls even with 14 buttons used for non-combat things, it's going to be hard to convince me that consoles have enough buttons to combine W3 with MK5.
All the more reason for K.I.S.S.
Needless complication is NOT a virtue.
Get rid of the "weapon reload" button everyone uses constantly. When your mag runs dry have the character do the reload animation. At the end of combat assume the character reloads their weapons so everything is ready for the next fight.
In W3 Geralt automatically drew, and sheathed his weapons when combat started/ended, there's another unnecessary button.
Inventory management can be greatly simplified by not having "junk loot" in the game.
Apparently they have a "InstaHeal" inhaler in the game (we're apparently stuck with magical healing, which I'll admit is better then the regeneration we see in most shooters), if they stick to CP2020 and don't add more and more "hit points" every level you need one key for healing because you don't need 5 different levels of healing items.
Etc.
By eliminating many of the gamey standard functions you see in most games you can free up a lot of buttons for other uses.
Which way are you going with that? Are you saying that ranged combat should lose some things that are actually useful for the sake of overly complicating something that should be simple in a game where that thing is only a relatively minor element that a lot of folks wouldn't even really miss? Or are you saying that we should eliminate clip size entirely so that we can actually remove the reload button without causing problems? Maybe retasking it depending on whether you have a ranged or melee weapon equipped would be a better idea than ripping out something many consider vital.
Also, given that drawing a weapon takes time yet RPGs often have some sort of social issue with unsheathed weapons, you really can't get rid of that button. I took too many hits waiting for auto-draw and wasted too much time waiting for auto-sheathe to want that sort of failed mechanic again.
You're also overlooking your own second sentence; Needless complication is NOT a virtue. How badly do we need CP2077 melee to be as detailed as a game that is
nothing but melee combat? I think complicating CP2077 that way is quite needless. I think it's overkill. There
has to be a middle ground here, and I don't think that that middle ground is to make gunplay or non-combat aspects unplayable for the sake of pleasing a few
Street Fighter fans. I feel that that middle ground is better achieved by making melee and ranged combat equal without makign CP2077 more of a fighting game than an open-world RPG.
Junk loot has no real bearing on inventory managment except insofar as junk loot causes clutter when you open up the inventory. Now, are you wanting all enhancements active at all times, or are you thinking that at least some 'ware should be switchable? That takes buttons. Sure, if you want to slow things down, you could do it like MGS did, but that was cumbersome as hell... and CQC still wasn't at the degree of complexity many here seem to want their melee despite that.
CPDR is going to have to do a lot of thinking to make a UI that balance all the elements in a way that is not only playable, but enjoyable. And you aren't going to get that by stripping out things that many consider necessary for stuff that helps one niche aspect. It's a tricky balancing act, and I suspect that no matter which way they go with it, a lot of folks will be unhappy.