For example I don’t know if a cheap mini PC like the GMKtec G5 would be more likely to have firmware/driver related security flaws over a more standard PC like an older Dell Optiplex from Staples.
Maybe there is something else entirely I am overlooking. I’m not sure. Most of the complaints I’ve heard are in regards to mini PCs containing bloat and potentially malicious things installed.
It depends on your exposure profile.
Installing malware and bloatware into an OS is relatively easy. Doing the same to a bios is doable, but a LOT harder.
If you’re after a mini PC for home use or even a small business, wiping the os is likely fine. The concern would mostly kick in with larger organisations or government level targets.
It’s a question of how many man hours of effort hacking you is worth. Even if they are compromised, they are unlikely to risk outing the breach for anything less than a high value target.