YOU SHOULD JUST WRITE USING UPPERCASE LETTERS ALL THE TIME LOL

Seriously though, don't do that. Using proper punctuation if you're a native English is easier to read for me. Lower case only is obviously much better than upper case only :) uppercase reads like you are SHOUTING

If you're too lazy to press shift you can use Grammarly free extension in Chrome and it effectively does it for you. Fixes your grammar. Especially useful for work emails etc