4th generation jets are not designed to survive denied airspace. They're still useful; both sides in Ukraine are using 4th gen jets for air patrol, SEAD, escorts, intercepts and standoff munition launches.

Nothing that makes them jet fighters is used. Propeller planes with launchers could do the same.

Putting flares, chaff and ECM onto a propeller plane doesn't leave much takeoff weight for AASMs and KEPD munitions.