In practice, linear texture means "don't mess with the data when sampling", and sRGB texture means "please convert to linear when sampling" (this is a hardware

In practice, linear texture means "don't mess with the data when sampling", and sRGB texture means "please convert to linear when sampling" (this is a hardware feature). On modern engines, rendering is done in linear. A lot of older engines render in unmanaged maybe-sRGB and look like potato, in which case tagging the textures does nothing. In general either the final render output is linear or "I don't care" probably sRGB, in the first case it's up to your display driver to do the final conversion to your display color space, in which case colors should look correct, but the game engine may have already limited colors (by some post processing magic) within sRGB boundaries if it's not aware of your display range. Or it may have messed up if it can't make sense if the display range. In the other case, I'm not sure if there's a solid definition, the driver will probably assume the color space is already good.