Have you, by any chance, attempted to communicate with a group? Have you, by any chance, had your messages delayed or - ostensibly - refused when attempting to do this? If you have attempted the former you will have experienced the latter. Unaccountable and inexcusable group chat delays.
Personally speaking, I have, and there is frankly no excuse for this, I am sorry. I fear that any attempt to tell me that a message of less than 4096 bytes cannot be distributed because, oh, groups or evil or something or other is going to meet with hollow laughter.