Valve amended the Steam survey for December 2025 - Linux actually hit another all-time high
(www.gamingonlinux.com)
Because using the latest drivers (and thus kernels) is important to play recent games, to get performance and bug fixes.
Debian usually ships an older LTS kernel (6.12 right now, while the latest stable Linux kernel is 6.18), so you might hit more bugs and performance issues in Debian than in a less conservative distro.