Memory/space selection should mention pros/cons, and that these can be altered later
I was about to create a new box, and then got asked a question that I have no idea how to answer: How much memory/disk space should I assign to the box?
Can I just allow all the memory and it'll take what it needs, or will it always take the max assigned? Can I grow the disk space if I run out, or shrink if I don't need it? Boxes didn't tell me. I figured that if it was changeable later, I could just Try It And See, but I wasn't able to easily google if it was changeable, so ended up asking on an IRC if it was even possible (apparently I should've googled for virt-manager and not gnome-boxes).
If Boxes included a line like "The assigned memory will always be used when the box is running(?), so don't assign all your memory. You can use the Customize menu in Boxes later to change assigned memory. You can use [otherprogram] if you need to change the assigned disk space later." then I'd be able to make an informed choice within a few seconds instead of wasting hours ;-)