The best media player available on linux. The worst GUI (none) out of the box. Bearable after tinkering a bit with configs.
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mplayer is what I used to use ages ago, can't think of a single thing I miss that it did which mpv doesn't. Like you, I was introduced to mpv through the debian disappearance, and it's been fine. Forks can be necessary to keep development active; it's one of the core features of FOSS.