[SXX]

It's reasonable to keep native code when you already spend months / years working with it. Or if you're huge company with hundreds of programmers that want to have own everything.

Though when it's relatively new game with own engine and small team maintenance cost for own cross platform code going to be high. Even on Windows there is tons of small problems that already solved within SDL. It's really not fun to debug problems of XP, Vista and some not updated systems.

PS: Also as far as I aware SDL2 currently used by all Valve games on all platforms. I pretty sure they wouldn't be using it if it's wasn't working well.

[yoklov]

IIRC Valve uses SDL for some things but also goes around it and uses platform APIs for other things.