They’ve been involved with MusicBrainz for over a decade and know how things work around here.
I’ve experienced them as being an encouraging person and particularly friendly towards beginners. Lending a hand where they can, sharing tips & tricks and tools.
Incidentally the voting request thread was also started by them
Concerning editing they add many physical releases that are not widespread including high quality scans. (Can’t do much wrong there unless you accidentally pick the wrong files )
Besides that lots of other accepted edits fixing the obvious.
There are only few downvoted edits which I’m not concerned about since most are rather old or not necessary.