My reasons for starting to use vim were not the best, just to get the "oh that's cool" points. Another reason is that it's not heavy on RAM. At the time I had a 4GB RAM laptop so opening VSCode and a browser would have its effects.
That said, I've used vim long enough now to appreciate the productivity boost it gives me. True, in other programs you can navigate using `home`, `end` and arrow keys etcetera. But If you know how to touch type, reaching the `home` and `end` keys takes a bit of time. Vim allows me to navigate everywhere without having to "drastically" shift my hands from their "rest" typing position. I could say the main advantage I get using vim is _I navigate across my project faster._
The only limitation I get is some programming/scripting languages are only better supported in VSCodium (like GDScript). So when working on those I use VSCodium.
IMO Vim isn't better than VSCodium, it's just a matter of preference really. Whichever does it for you is the better one.