> No investor is going to give you specific feedback.

That depends on what you mean by "specific."

Several Sand Hill Angels members, who are investors, provide feedback almost every month. (It's in the context of a pitch, but...)

See https://www.sandhillangels.com/raw

("pitch practice" is somewhat misleading.)

[edited to add some detail]

The typical angel-group pitch has three parts, the pitch, the Q&A, and then the "with the entrepreneur out of the room" discussion.

This event lets participants listen to that discussion, as well as those three parts for the other folks pitching the same night.

Then there's an "ask investors anything" session at the end.