Analogue left stick is the best way (in my opinion) to handle movement, and mouse input is the king of aiming, so why not allow both side by side? While perhaps not the totally bog standard S-Box/PlayStation controller style, there are devices like the Steam Controller which have a trackpad instead of a right thumbstick, and devices like the Steam Deck which have both. The demo has this feature (although the displayed keys flicker back and fourth while using controller and mouse simultaneously), but trying to do the same in the full version is glitchy and functionally unusable.

If it matters, Nioh 2 and Elden Ring both have this feature, and it's amazing.

An even better option would be to handle control bindings through Steam Input rather than in-game. It's not something you see much anymore outside VR, but there are games where you can set all the controls via Steam. Given all the options for input modes, action layers, and macros, this would be a huge improvement in the flexibility provided by a controller.