They are working on an OpenWRT Two at the moment which will be Wifi 7. OpenWRT runs on a lot of hardware and its a great way to extend the life of a router past the manufacturers patches as well as gain a lot of capabilities. I wouldn't buy a commercial router that wasn't supported by OpenWRT now.
Is there any closed-sourced firmware that exceeds OpenWRT performance on the same level of hardware?
I think that some proprietary firmware may have hardware optimizations that aren’t possible in a community-developed environment.