Its more like, if x team doesn't deliver a functionality that y team needs, y team would need to come up with an alternative/short term solution in order to ans

Its more like, if x team doesn't deliver a functionality that y team needs, y team would need to come up with an alternative/short term solution in order to answer y customers/users. Sometimes alternatives doesn't go away even after a permanent fix comes along. Also since Meta is multi app you could have one solution for FB and one solution for IG etc.