Agree. For us slow typers who have also other things to do it is a pain in the ass to check all the grammar mistakes etc. and type even more slowly.
Using text format isn't a nice thing for others to read either.
So if me (with no education in English) can take the effort to write full words and sentences, so why not others who grew up on English?
On the other hand, this isn't an English teachers forum, so it's not a big deal but can understand why it's annoying for some.