For me my workflow efficiency is very important. One thing I do a lot in Figma is duplicating objects by holding alt and dragging. In Figma I can hold alt before I start dragging, and I can hold alt after the dragging has already begun. This means I can’t mess up because it works both ways.
In Penpot, if I don’t press alt before I drag, the object won’t duplicate. Because I move fast, I’d say half the time I press alt after I start dragging. I don’t want to have to correct this mistake over and over again and I don’t want to have to think about it. That slows me down.
It seems like a little thing, but anything that makes me feel more efficient and make less mistakes increases the perceived usability a ton.