It doesn’t see much use in games because most controllers don’t have it. So games, by and large, ignore finger tracking for anything more than cosmetic use. That’s not because finger tracking wouldn’t be useful.
Notably, VRChat does make full use of finger tracking. It is used to control your avatar through natural gestures, and it is a very effective control scheme. Along with full body tracking, VRChat is pretty much the only “game” that fully supports these technologies. But it’s also the most important one, because VRChat is not just “a game”. VRChat is a major social VR platform.
Finger tracking is also useful in multiplayer co-op VR games. What makes these games so fun is the level of interaction and presence you have with your friends in VR. It’s very much like a social VR platform in that respect (assuming it’s done well). Even when finger tracking is used only cosmetically, finger movements are a major part of non-verbal communication. Without the non-verbal cues VR is able to carry, you might as well just be using a Discord voice call the same as in flat co-op games.
So if you never use social VR or play multiplayer co-op games where you have some sort of avatar (ie. if you only play flight sims and/or driving sims), then yes, right now finger tracking won’t have much utility for you. I think a disproportionate percentage of the people who post on these forums are flight simmers, so that case may be overrepresented here. Flight simmers barely need the hand controllers, much less finger tracking.
Even used only cosmetically when you’re the only one that can see yourself though, finger tracking does increase VR immersion. Or maybe it might be more accurate to say that when you move your fingers in RL, but your hands in VR remain static claws, that’s immersion breaking. Not hugely, but its another notch.
(All this discussion about VR controllers is off topic for this thread about the DMAS. But I think there’s meaningful content in it, so perhaps a mod could separate these posts into a different thread, please?)