This has been done to streaming versions, but thankfully it's generally not possible with discs. The blu-rays you buy are pressed, not burned. They are read-only. Changes are only possible with re-releases, and this has happened. For example, the Criterion edition of Miller's Crossing is a different cut from what you would have seen in the theater, though they don't make that very clear.
Perhaps my wording is not quite right in my post: I'm not arguing that all BD releases include special features, but that it isn't a fault of the format. BDs absolutely have other perks. Most BDs, even TV shows, have the DVD special features copied over. If the BD release doesn't have them, then yes, imo it's probably not worth it.