The medium is the message.
Discussion
I don't have any issues with clients setting a character limit. I just don't agree that typing 211 characters means I have to go to another client to write a long form post.
at the protocol level
It's what made twitter great.
THIS.
https://web.mit.edu/allanmc/www/mcluhan.mediummessage.pdf
I'm not 100% sure this is what Gigi is referring to, I'm sure he'll correct me if I am wrong.
Maybe not, vagueness is a good tool sometimes.