Has anybody stripped the Sandzak and Presevo Valleys from Serbia?
No, because the Serbs haven't embarked upon an ethnic cleansing campaign there like they have in the places where they have lost territory.
The Serbs lost their mandate to govern Kosovo, and Kosovo is keeping its existing borders.
Its not as complicated or illogical as you're viewing it.
Based on that logic, then Kosovo Albanians lost whatever "claim" (legitimate or illegitimate) they had to Kosovo in March 2004 when they went on an ethnic cleansing rampage against Serbs.