I’m on a machine w/ FreeBSD 15.0-RELEASE right now and my AMD GPUs mostly work (minus some features like manual fan control or overclocking, also certain shaders may make the driver crash). They pull in the amdgpu driver code from Linux so you get the same experience for the most part. Bluetooth is very hit or miss in terms of drivers. (Also I find OSS to be better than any audio “solution” on Linux.)
I haven’t been able to get Steam to work reliably. It starts up fine the first time after a fresh install. But on any subsequent startup it just hangs indefinitely. I also haven’t messed with WINE since I don’t really have the need, but FOSS games/ports generally just work (OpenRCT2, OpenMW, Quake, Doom, 0ad, SuperTux, Wesnoth, Xonotic, etc.).
As with Linux distros, I just recommend installing it on a spare machine or drive to see if it works for you. Definitely consult the FreeBSD handbook for guidance though.
You’re underestimating children. When I was around that age I had to fix my broken PC because nobody around me knew how to (parents didn’t care for Computers) and the next repair shop was far away.
My only support was some of the IT staff from School and books. I was setting up Windows 95 and making my own DOS boot floppies before I hit my teens, and I’m just the average working class person.