Super !!!
Will it also include FULL profiles, so not affected by future changes in the base profiles?
No, because it's an illusion to think that a profile with the same values will give the same result with a higher version. We constantly tweak behaviour, add features or change how certain things work together. So the value of "50" that meant something in version 1, is not guaranteed to mean the exact same in version 2 (it might be the equivalent of 49 or 51 or even 100). So storing those full profiles is pretty meaningless. If you want the exact same result, do what big companies also do with operating systems. Pick a version and stick with it (as can be seen by companies still using windows XP).
Another reason that we can't flatten everything and load that again, is that if you do that and load a workspace, it would see everything as a "changed" setting, which kind of defeats the purpose of having a profile in the first place. If you then were to switch a material on one of your extruders, it would not update any settings because they are overridden (which I'm assuming you also didn't expect to happen!)
TL:DR; There is no such thing as a future proof profile.