Right, full hair physics is just not economical. It's too intensive, even in 2022.
This Nvidia demo is from 2004, 18 years ago, and no game even today has looked this good.
Most games just use like rigid bodies for pony tails, or if they do the hair, it is a very simplified model, not each strand. Tomb Raider had probably the best I've seen to date in an actual game, using what AMD calls TressFX.
I believe this is possible in Godot 3.x, but you'd have to code it yourself. But TressFX is open source, MIT license, so take a look if you're interested.
https://github.com/GPUOpen-Effects/TressFX
