I've used Intel NUC's and currently an Asus Mini PC with an AMD Ryzen, all of them cost just a few hundred dollars including SSD and RAM, and had zero issues running both Umbrel and Start9.
And yes even tried out running Start9 on a Raspberry Pi. No issue there either.
Definitely don't need expensive hardware.
For example, it could use chips with open source firmware, or guarantee chain of production is outside of china, etc. Bitcoiners would pay more for that I think.
This is exactly what they should do, but given Umbrel itself isn't even FOSS, I don't have high hopes they will.