Jettison vs Launch
We’ll have to ask a Typhoon expert - but in 2 of the warplanes I’ve flown you couldn’t jettison A-A weaponry - because the system was designed for the situation where you wanted to EMERG JET due to threat - and denuding oneself of A-A weaponry in such situation would be dismal.
In fairness, on a third type you couldn’t jettison belly AMRAAM or wing mounted AIM-9 - but you could get rid of wing mounted AMRAAM.