Honestly some customers I've encountered have asked for stuff like this (and similarly meetings to go over product roadmap) almost as a power play. Either to see if they can get us to do it, or to feel like they have control over our development. If you're small enough and the customer is big enough, you might not have any choice, but I resist it pretty strongly unless it would be financially ruinous to lose the customer (and we have never lost a customer over refusing to do it).