I don't disagree with any of that =)

It's what I've been doing, I'm asking what I'm asking to see if it surfaces anything that I've been missing / not thinking about and trying to work out what people would see as table stakes

In the same way that I know that playtesting reveals flaws and gaps in my design and thinking, this is a earlier version of that process that has in my experience helped me when building non-game related things

It may very much be the case that this is not the kind of thing that I should do when focused on building a game, but I don't think it hurts to ask