Even back in DVD days (they're over, right?) there were players that had problems playing discs that utilized seamless branching. But we should not forget, seamless branching and alternate angles is not the same thing. Video angles can be used if the running time is identical in all angles (and the multi language crawls on the official SW DVDs used angles), while seamless branching provides in fact alternate "playlists" of parts of a movie so the play time can differ.

Unfortunately angles are still diffcult to pull off.