The problem is getting support for Wifi 6E on your devices. Not to mention, to really benefit from 6E, you need a mesh network, preferably, powerline backed. And a router in every room. OpenWRT can run just fine even on older cpus(depending on what you use), the big thing that cuts you off from updates is the flash memory. More flash memory is future proof for updates and more features you can install. That said, does OpenWRT even support Wifi 6 yet? Due to the whole driver stuff. And some routers can't ever run openwrt due to no drivers available. That works for pc, but for PC you can just do ethernet/powerline, the real ones you want are mobile devices. Try upgrading those for $10. This is why I fear when PCs start going ARM. Cheap upgrades will be a thing of the past. Not because ARM doesn't support upgrades, simply because the ecosystem is centered around everything being embedded.