And they take compatibility seriously. I’m a refugee from home assistant from 5 years ago, when each major update would break part of my automations because they deprecated some API. No such thing with Hubitat.
That said if you're up for fiddling, something like https://www.amazon.ca/Waveshare-VisionFive2-Processor-Integr... will provide much more oopmh (and it's RISC-V) with 4GB ram and m2 slot, at $100 CAD, with mainline kernel support (so any USB devices will just work). Grab a zigbee USB + SBC like that, and you'd be able to run much more on your hub that just a gateway for your devices.