Is it frowned upon to put comments on a submission page? I can see people wanting to ask clarifying questions, but I imagine it wouldn't be great to have people sharing opinions of the system while voting is still going on?

You are more than welcome to leave comments on submission pages!

I would only ask that:

• If you plan on leaving feedback, make sure that it's constructive.
• If you plan on sharing your opinion, make sure to follow Wheaton's Law.