Can't believe you forgot the usage limits on how many tweets you can view and how many DMs you can send. I think some of those might have been walked back, but I know people who were holding back from discord because twitter DMs were enough that now rarely go there.
Also all sorts of API functionality has been killed off - embeds, RSS, bots, etc
You're not wrong of course, but I really need people to understand that this level of detail is not what a top-level reply to a lower-end technical question is aiming for. Maybe this will be helpful to someone, but I already knew it and didn't need it sent to me, and it's going to go above OP's head. For the average end user, this is abstracted somewhere in the "host stuff" layer, and that's fine.