So, I realize we don't actually have a consensus definition of what a recommendation question is at this point, but bear with me.
A question was asked recently about how to get feedback on a homebrew pokemon/D&D crossover class. The question was put on hold, not because the question was asking for reccomendations of sites, but because the querent expected that a recommendation to a site would probably be the best solution. That seems bizarre.
To wit, the question was essentially as follows:
I have a homebrew thing, and I want feedback on it.
I have tried asking people about it locally, and that was useful, but I want to get feedback from a broader and more diverse and experienced audience.
I don't think posting it on a random forum would be helpful, because in my experience that follows a particular unhelpful pattern
How can I get good feedback?
It's true that what the OP thinks they want is a site or lists of sites that solve their problem. But the OP was open to the changes that made this about feedback in general, rather than sites in specific, since it's still about solving the problem they want solved. And it's true the best answer may well be "go to X community, which was established for providing feedback on pokemon/D&D crossover classes and has an active userbase with a similar playstyle to you" or whatever, but our prohibition (at least, as of the last time the moderation team for this site talked about it) is on content in questions, not answers.
It seems like "How can I get a certain kind of feedback on X specific thing?" is a question we really ought to handle, since it's entirely in line with the purpose for which Stack Overflow was created (sharing insider tricks by experts for common-yet-niche problems experts face), and I see no reasonable way that can be understood as a shopping question, whatever the querents preconceptions about what a good answer would be.
There's little point in ropening the question now, as the querent was a volatile user and I'm pretty sure they've abandoned it after the most recent changes, but this is yet another casualty of our seriously flawed tool-rec situation, and the ongoing fallout from that meta-fiasco. I think it's something to be aware of.