The link is very interesting, thank you. It is very strange to me that the Dell throttles both CPU and GPU when on battery power. I am not a Windows expert so I don't know if that is a setting that can be changed somewhere. Personally, I would hate it. But that's Windows, not a hardware problem.
OTOH, I really like the 15" Dell XPS. It's arguably a better laptop than the MacBook Pro--and a lot cheaper.
I looked into
That leaves Linux as the only viable OS for me.