And the director / talent commentary tracks, which were sometimes really great (Vanilla Sky comes to mind). I think that was only common for a really brief period unfortunately. To be honest I think it just failed from a market perspective (cost vs revenue). I could be wrong and maybe it still happens a lot?

Suspect the angles thing was the same. Sounded cool but no one wanted it (or to pay extra for it).

It still happens a lot but those tracks rarely make it onto the streaming service copy. Usually you need to buy the disc version.