They may be more redundant.. if that is what you mean to say..
Twin engine safety is preferred over the sea.. yet the F-35 is single engined.. the F-8, the Fj fury.. the F9F.. the super etendard.. etc
Twin engines are safer in the case that if one flames out.. you still have one to keep going..
In combat too.. they offer an advantage.. if one of your engines gets taken out.. you still have one that might help you get home..
although on fighters such as the F-6 and jaguar ..with engines spaced closely together.. that may not be such a help.. since its quite likely both engines took the damage. or if one decided to go up in flames..the other wont stay cool for long.
Now.. come to other factors.. twin engines.. more fuel for each engine.. the jet's fuel fraction decreases..
more maintenance.... your turn around time is effected in wartime.
Two pieces to pack.. your jet grows in size.. so does its RCS..and its visibility to the nakes eye.. the F-16 is a lot harder to spot from 7km than the Mig-29.
They burn a LOT more gas.... means for that very gas.. you could get two single engined fighters up..and a lot farther... which is great for peace time flying.. we arent always at war.
If I were buying a fleet of jets for combat, I would want capability for my money. The long term benefits are better. The extra motor, which is of duboius benefit with respect to survivability,will cost money that could be used for a few extra airframes. If we loose a few that might have made it on one motor, we are still ahead. And when we consider logistics, the single-engine comes out ahead.
Now.. coming to overseas exercises.. lets call it simple.. the PAF has generally been more media savvy..
whether it was hiring a brit to do the story on us.. or getting in with the yanks..
The Indian's alignment with the USSR did not help either.. they really did not know media that well.
The IAF has in the past participated in exercises with the EAF..and the RN.. amongst others.. but due to the alignment of most of these participating nations with the eastern bloc.. the flair never got out.. but that does not mean the lessons did not.
Also.. participating in airshows.. etc.. is part of your image..its just PR for the PAF..
we are active participants in the anatolian eagle.. ATLC.. small less announced participations with arab nations and the chinese..
and have quite a few exchange pilots abroad.. some in nations where others dont go.
So our participation is pretty meaningful as well.. thank you very much.
Old aircraft.. does not mean bad pilots. .. and those underestimating the F-7PG.. are really digging their grave.. there is a LOT more to it than meets the eye.. period... F-22,Rafale and EF pilots testify to that.. (im going to see who posts the "i wanna link" post here
).
as far as the increase in crashes go... do intensive flying hours on increasingly aged airframes mean anything to people.. somehow this is bought up when the Mig-21 bison was concerned.. but conveniently forgotten here by some to score
points.