What's your ideal (presently available) laptop? Forget OS considerations and assume you could have a Mac version of whatever exists now. If you want a 10 lb gaming laptop, you get the 1 hour battery life, the weight and the fan, though (desktop CPU or GPU with decent battery life and reasonable portability isn't a viable option unless you can point to a Windoze machine that offers that combination).
My personal answer is "the next size up" from the top MBP - HP and Lenovo make stuff that's slightly thicker and heavier than a 15" MBP, but not much, and offer better keyboards and cooling, 64 GB RAM capacities and 4K screens (possibly with a bit more GPU power). They don't support 2.5" internal drives, but they DO offer a few more ports (not Ethernet, but yes to HDMI and both USB-C/TB3 and old-style USB)
I just don't see enough difference in the 6 lb workstations (personally) to justify them over the 4.5 lb versions. They'ere heavy, but not unreasonably so - but they don't offer a lot that the 4.5 lb versions don't - same CPUs, screens and RAM, maybe a little extra GPU or wired Ethernet, plus 2.5" drive support, but are those things worth an extra 1.5 lbs?
The 8-10 lb gaming machines do offer more power, especially on the GPU side, but the tradeoffs are huge - huge (sometimes dual) power adapters, roaring fans and 1-2 hour battery lives...