If I remember correctly, several years ago the attitude here on HA/FB2K forums was that ID3v2 was a messy spec (and prescriptive and poorly implemented in most software). Which is why foobar2000 pushed APEv2 as a simpler alternative.
The reason I use APEv2 is for consistency and simplicity. I am less concerned about other application support. As I have noticed in recent changelogs, the mapping of fields (e.g. album artist) to various ID3v2 frames (e.g TPE2) may change over time. So some files in my library may end up with different tagging schemes as a result. This is exactly what I am trying to avoid, and this is why I want to stick to the simplicity of APEv2. The field you see is the field you get.
Is further development of FB2K's MP3 APEv2 implementation abandoned in favor of ID3v2? I am especially curious to hear Foosion and/or Peter's opinion on this, and of course others too. If such development is not abandoned, do you think support for embedded album art pictures via APEv2 is a possibility?