If all you’re going to do is to run Windows you’re better off getting a windows laptop
I tend to disagree. I mean: if you don't prefer the MacBook hardware, sure; but if you do (as the OP indicated he might) the Mac is otherwise a competent mobile PC that's
mostly equivalent to any other Windows laptop with equivalent specs. I'm typing this in Windows on my 16" Pro right now and I've long used Windows via Boot Camp with few issues. Not no issues, but few relatively speaking; and these are discussed below.
It's true Windows is nowhere near as power-efficient as macOS. But on my old 15" (2015) I used to get pretty good battery life considering (6-7 hours under light load or only an hour or two less than macOS). For some reason on my new 16" the estimate isn't that great at the moment, but I haven't activated Windows yet so I can't do much customisation or tweaking. The estimate might also be poor because I haven't run it flat in Windows yet (or Mac really; it's only got 2 cycles!). I'm expecting a solid 7-8 hours under light loads with the maximum Battery Saver setting enabled, but this isn't confirmed and it's currently not looking likely, unfortunately (edit: my iPhone was plugged in so that probably affected it). If it did (as it should) that is still far better than a lot of Windows PCs; many of whom have smaller batteries or come bundled with lots of bloatware. If it could use integrated graphics that would help, so it's definitely still one of the downsides of using Windows on a Mac, but for maximum battery life for light tasks like browsing I'll just boot into Mac anyway, so it's a non-issue for me. The Windows tasks I use it for are work and productivity or gaming when I'm mostly (or for gaming always) plugged-in at a desk. If you want to use Windows primarily, you can give it the majority of disk space when setting up your Boot Camp partition, but I'd certainly recommend keeping at least a small Mac partition for those times when you need maximum efficiency and battery life.
The other issue is that Apple/AMD (it's hard to tell who exactly is at fault here) are very slow to update graphics drivers, so you get far less support for them. Many people can install hacked versions of the drivers without issue, but this is unofficial and unsupported.
Other than that, I've found MacBook Pros to be an enjoyable way to use Windows. In answer to your other questions, yes brightness and sound volume (and features) are fine, but the Touch Bar has only limited support in Windows. You get two options for the Touch Bar: a setup that mimics the previous Mac's brightness, volume, audio track skip/pause/play etc setup, or a straight-up 1-12 Function keys.
