“lost”, in the output to a monitor or printer that can’t handle the gamut. Export for your purposes is not the primary use. I get the efficiency of saving the internal image already in the working profile, and the RT devs may be able to provide insight into how that might happen.
And that’s where I need to leave it; the folks who develop RT will be better-equipped to explain what it does and why. I just pitched in because I happened to have tools handy to pick at some of the profiles.