Power management is quite frustrating on Linux, as this is supposed to be tuned by the OEM, but many OEM never bother to tune it on linux.

Even large OEM like dell only ensures all their hardwares "work" on linux, but don't do much further tuning. And many like hp and lenovo sometimes don't even to bother make their hardware work.

This is why buying from small manufactures with good linux support is important. They not only support both windows and linux well, many often come with additional perks like built in country with reasonable labor practice, repairability, upgradablity, no phone tree in support, and supporting Linux desktop development.

Personally, my framework AMD has great battery life on linux by default. And I am sure manufacture like system76, tuxedo, slimbook, starlab, novacustom, etc. all works well.

i play roblox through vinegar all the time and it works perfectly out of the box

I use Grapejuice. It's a simple flatpak that I can install and it just works. You just need to go into its settings and choose between Vulkan, D3D11 or something else if the performance isn't good.

EDIT: just found out about Vinegar, I'll try it later. Apparently it's better than Grapejuice

EDIT 2: the game doesn't launch with it even after following the troubleshooting instructions, so if this doesn't work for you use Grapejuice