I think that Excel Online could use auto corrections
When I use Excel Online, I always think that I spell everything right. Unfortunately, I am not. Excel could improve very much if it had an auto corrections system. Even though my computer has auto corrections, I believe that I can be much more accurate in my 'books' if I could spell all my words correctly. Especially if I have to show it to someone else, I don't have to have them correct me every time they see a misspelled word.
Which is fairly often.