In my experience, sharing ideas (which are opinion-based and not really questions by nature) is fine in meta sites. The posts can be:
- Announcement posts. For example, in Net Neutrality and Stack Overflow / Stack Exchange it is specifically said that "if you've got something to add, please do write an answer!"
- Observation posts. For example: Case Study: First Answer Bias or Technical support: rational vs emotion in Academia Meta
- Proposal posts. For example: Answers vs Advice in Buddhism Meta
So I think it is perfectly fine to sharing ideas on meta without asking any question. I want to make sure if my understanding is correct, because I have such an idea about Stack Exchange vs Reddit and am quite surprised when it is downvoted and closed.