The 2080 Max-Q only exists in ~$3000 gaming laptops. Poor battery life, 4lb+ laptops.
I have an ASUS Zephyrus G14.
1680g(3.7lb) as checked just a minute ago using a kitchen scale. I don't know about battery life because I capped the charging at 80% and it still lasts a whole day of normal usage if need be. MSRP ~$1,500 in the US.
I don't think it's remotely so simple.
If you compare it to the Ryzen 4xxx mobile CPUs it checks out - performance increase is roughly as expected given the difference in feature size.