[1] https://github.com/clsid2/mpc-hc/ [2] https://github.com/Aleksoid1978/MPC-BE
All that said, VLC is not always my video player of choice. On Windows, I typically prefer PotPlayer and MPC-BE. On MacOS - IINA. On Android - MX Player Pro. But I always keep it installed on all those platforms because I know that I can fall back to it reliably at a moment's notice and it will simply work.
Additionally, with regard to MPV, where I think it makes the most sense is for the highly discerning user who wants to tweak the rendering of video in a specific way. I think anime fans really like it a lot (I'd imagine they upscale or improve the image quality in very subjective, specific ways, though I didn't investigate this in detail). The other good use case is when you have somewhat limited hardware and you want the most efficient video player application. That is perfectly valid, I suppose, but I think for most people, whatever hardware they're playing a video file on is likely more than capable of running with a more 'unoptimized' video player app such as VLC.
99% of the time I use it, I just want to play a local video file or watch a web radio stream. I don't want to create a playlist or browse my computer using a built-in media library, yet both are front and center in VLC.