In-der-Blog-sein
The Encounter
says as if about appropriation and expropriation that:
Heidegger highlights that every posit inherently contains the absence of what it is not. Hence in proposing to do something you are proposing to not do everything else (that is mutually exclusive). As we are getting older we realize that we do not have much opportunity in this short life.
Heidegger is not on about merely the either/or nature of choices. His is an existential point, that things alternately come into existence for or get hidden from dasein.