MusicBrainz Picard "v2.9 Beta 1" with new default settings to use ID3v2.4 instead of v2.3

This puzzles me - MP3tag and Foobar2000 have been supporting multi-value fields for a very long time in V2.3.
But the players usualy spoil the game.
Instead, they implement their own way as has been discussed in this thread: