Right, BattleEye is hit or miss depending on the game developer.
Another significant drawback I have is OBS compatibility. It technically works, but just having it open drops my framerate by ~30%, and having it record drops it by ~50%. I haven't found a fix for it yet, so I'm effectively unable to stream or record gameplay on Linux. The same settings used in Windows hardly impacts my framerate.
I'll continue using Linux, but I haven't deleted my Windows partition yet.
They're referring to the white buildup that happens from the aluminum in antiperspirant. Deodorant without aluminum (and therefore not an antiperspirant) won't give this buildup.