I've chatted with a few of the users behind this proposal in chat (and internally with other members of the Community Management Team), and while this proposal does seem to have some areas of overlap with existing sites on the SE network, it also appears to be worthy of a space of its own.
That being said, I didn't see these areas of overlap or lack thereof being mentioned in any other discussions around this proposal.
These are better discussed, even if on a high level, before the site launches into a private beta. Naturally, they can be slightly adjusted later as the site grows and evolves, but at this stage it's important to explicitly highlight where the gap is with the current sites available, potentially even listing types of questions that are currently being closed as off-topic on other sites but would be allowed here. Doing so now would assist in having a better definition of the scope of this site, as well as making a case for its necessity.
As such, I wanted to invite the folks behind the proposal to highlight:
- which existing sites would have some level of overlap with this one, and
- which topics wouldn't fit on any existing sites.