Ideas: The ability to organize my presentations into folders to make it easier to find things as I have a lot now.
The ability to adjust elements on slides like you can in powerpoint.
Resizing photos to make them smaller, add space around them, make them bigger at the top so that you can see more of that image etc.
Exporting to powerpoint has consistent sizing. Right now titles are mostly 44.5 but sometimes 35. And, the font sizes of the text on the page can also range a lot. Gamma gets me 80% of the way there and then I spend time making the decks consistent in look and feel.