Username Changes:Very annoying

This username change is kinda annoying .I can no longer use capital letters or special characters,in my username I used to have a heart that was this:<3 and I don’t remember if it let me or not.but now I can’t have capital letters and it’s kinda triggering bc I liked using the capital letters and grammar.Now you have to get valid usernames last time they had the numbers and the hashtag so it wasn’t a problem bc everyone had unique numbers even if there user was similar to yours