EDIT. Actually it looks like I was wrong about that. They do apparently at least make their own chassis’s unsure about the motherboard’s or screens though.
System76 has long been working on their own laptop - every few years they make a progress report announcement - but I don't expect to see it anytime soon.
https://us.starlabs.systems/blogs/news/coreboot-on-the-amd-s...
For a Windows computer, x64 makes sense because backwards compatibility is a big deal. But a Linux machine doesn't have the same problem, at least not to the same degree. Couldn't an ARM-based design be used to make a Linux laptop with Apple-like performance per watt?
I agree with you that it would be more rare than trying to live in Windows ARM world, but I’m not sure it’s entirely a lossless experience yet for your personal computer.
The StarFighter has a metal case, so when running at high power levels (45W sustained according to the spec sheet) it will either get uncomfortably hot somewhere on the case or at least a bit noisy from the fans, but since it's a bit thicker than the 2019 MacBook Pro it should be able to cool itself more effectively. But when running at the performance level you're used to the power draw should be plenty low enough to make temperature and fan noise not a problem: roughly double the peak CPU performance means you can turn down the power limits a lot and still have a better-performing machine.
I recommend looking for a used laptop with a Core Ultra 7 165U (<$500) or a Core Ultra 7 268V (>$1000). Maybe an HP EliteBook. Either one would be faster than your old i9 and run much cooler.