That's something I might indeed implement, with a couple of caveats. If possible, I'd like to have a -deterministic option, where the output MKV files with the same command line are always bit-identical, if things like DateUTC/SegmentUID/TrackUIDs/_STATISTICS_WRITING_DATE_UTC are manually set identical (or -disable-track-statistics-tags is used for the stats). If this is technically difficult, though, please ignore this suggestion. A deterministic output would have a few obvious advantages you can easily see the output is ok (no accidental hw error occurs while muxing), by just running the same command line twice on different machines, and check if the two outputs are identical. One might misunderstand you if you keep using perceived trick-to-click to a commercial site run by a company paying you, so I thought it might be your problem.

I have nothing against many users who love YouTube, but a few users do avoid YouTube, as seen in a comment to a DEF CON 2019 talk video “ YouTube version (for those who can tolerate surveillance capitalism)”. Thanks for taking your precious time, making this more transparent, and I'm sorry I annoyed you and made this thread awkward because of my comments about something that might look paranoid.

MKVToolNix GUI: update check: the dialog showing the latest news & version information states explicitly where the links take the user (the MKVToolNix 'NEWS.md' file and YouTube respectively).

Mkvtoolnix gui set track uid