I'm not sure what to do with What languages and platforms exist for multicopter development? (formerly Cheapest MultiCopter Development Platform Starting points, now deleted).
Literally a week before SE's recent changeover of closing functionality, I had looked into what our most-closed questions looked like and noted that shopping questions were a large chunk of them -- but I considered things like "what products are available to solve my problem" to be shopping questions.
Now that SE has lumped shopping questions into "opinion based" questions, I'm not sure if my classification still applies. Where is the most up-to-date explanation of what constitutes a shopping question (specifically, whether "what products are available to solve my problem" is allowed)?