(I didn't apply this round) but things like that might give you some insight. Mostly on whether it's worth applying again. If they say there #1 reason is 'no cofounder' you'll get one and apply again later. if there #1 reason is 'not our kinda product' then you won't apply again. There reason could even be "I don't get it" and you realize your pitch may be the reason to blame.

No feedback is not really helpful to anyone. All anyone knows is they were rejected for potentially arbitrary reasons.