Once you’ve decided “I want to give them a scroll now” or “I think it’s time they deserve to get a spell staff”, how do you go about choosing which spells those are?
I assume different people have different ideas here, there isn’t one right answer. This is meant to be an open-ended discussion prompt.
Oh I see!
To be fair, my answer there was also back when we were playing 5e. But I felt ok sharing it here because the general story was system agnostic, dealing with how puzzles with a reward are cooler than puzzles that block story progress, and reinforcing the cool idea you brought up about using custom homebrew spells as reward items.