It's been just 2 years since the OLED release, I think we're closing in on a refresh. Unless a deck is a year away from a generational bump. A refresh could include the updated joysticks featured on the Steam controller, though.
Till then I'd think I'd do more good for Valve to focus on their steam app and store experience.
I think they recently said they aren’t looking for a refresh for at least 2 years https://www.pcgamer.com/hardware/valve-says-a-next-gen-steam...