I'm talking from experience though, when I upgraded from my own Atom Z3740 tablet/laptop to a Pentium 3805U I quickly got frusted with how sluggish it was on modern websites and ended up replacing it sooner than I'd liked for a Ryzen 2500U which is a night/day difference. I guess my tolerance is just very very low.
I admit, I wasn't aware Chromebooks locked their BIOS, I thought they allowed installing any OS you wanted.
But yeah its fair to say its a HUGE upgrade over what they had before, I'm just confused at the "specs makes other laptops look lacklustre" because apart from the RAM and SSD size, it kinda doesn't. I wouldn't be surprised if 4Gb RAM on a faster CPU still works out a better experience than 8Gb on a weaker CPU, as long as the SSD can keep up. Plus if you pick the laptop carefully, slapping another 4Gb in is an option, I had to do that with the Ryzen.