Of course, if you really want to be a purist you could use ffplay.
I think it's worth it, but to get the most out of it, you'll need to customize it to your liking (tweaking the OSC, the keyboard shortcuts... you can do many things, but it requires some reading/searching).
[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.