Maybe a niche concern, but SDL2 is still in Trixie. The sdl2-compat layer (translating SDL2 APIs to SDL3) is in testing, where SDL2 also exists side-by-side with it and is intended to be used to test and verify that SDL2 apps that use it are actually compatible.

Night-and-day decision-making process compared to Fedora and Arch, which both replaced SDL2 with sdl2-compat, broke a bunch of SDL2 apps because sdl2-compat isn't actually SDL2-compatible yet, and sent everyone to yell at the SDL team about it.