Product manager skills do not overlap much with dev skills.

If I put some devs in front of a customer I'd be very much afraid of them doing what they ask rather than what they want, for instance, or overindexing on one particular customer's problem.

If the devs understand and can empathise with the users and there aren't a lot of them, sure, maybe but on most projects it's more effective to have the distilled and filtered customer feedback from a PM who is good at being a PM.