Most developers use SDR sRGB and are blithely unaware that all iDevices (for example) use HDR Display P3 with different RGB primaries and gamma curves.

This shouldn't matter as long as everything is tagged with the real colorspace; it'll get converted.

If you forget to do that you can have issues like forgetting to clip floating point values to 1.0 and then you get HDR super-white when you expected 100% white.