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Bottles is a sandboxed environment for Wine an let's you tweak the wine configuration per application. It's also very user friendly, not intended for power users.

It's a different use case - bottles is really good for playing games outside of steam (like pirated titles or non-steam games) since it has sandboxing + you just drag and drop the game folder, then add executable as shortcut and run without having to fiddle with paths and set up each game individually. Convenient for software too that runs better on proton too.

If you don't do/have a need for any of that, then you don't need bottles.

Older games I believe run really well on it.

Also anything that might need a windows like environment like Doki Doki literature club I think