Spelling. It should use key distance. Typing "hrapg" should suggest "graph."
Grammar. The tense of the verb is never suggested correctly. Just previous, as I typed suggested, it gave me suggest until I got passed the whole word.
Responsiveness. If I type "early," I start with "ea" and I notice "early" as a suggestion. I type "r" as I reach up with my other thumb to select "early," but before I can even stop myself, "ear" now suggests "" (the ear emoji) and I inadvertently click it.
Editing. If I deleted a word at the beginning of a sentence, the new word is needing to be capitalized. I click the word, and that suggestion doesn't appear.