Questions seeking feedback about any topic, are, by definition, opinion seeking questions, and questions that could lead to opinionated answers are discouraged on Stack Exchange sites.
However, on many of the meta sites, the discussion tag seems to allow it, though, there's a part that concerns me (emphasis mine):
The question you're asking is designed to solicit opinions, influence site policy, or debate a particular topic, with the goal of reaching a community consensus.
When asking a question that seeks general feedback, is the intent really to seek a community consensus? If not, then wouldn't that qualify the question as off-topic?
With that, is there a safe space to ask questions seeking feedback? Examples could include requests for feedback on a new addon or modification for a game.