Having played Monster of the Week, I think I agree with you about PbtA systems. They're fun, but I tend to get a little bored with them after a few sessions, especially since I like to make characters who don't really fit into any of the playbooks. The best fit of a playbook at character creation rarely has more than a few plays I would want to spend experience points on.

I will say, though, that I like the experience system in PbtA games. It does a good job of helping players feel like they accomplished something each session.