Crewmeal - I like the idea of sticking to one/the best. That's usually the behaviour of sane people who have done their homework and forward planning. Usually such people aim to keep costs to a reasonable level.
Let me remind you on the matter of planes - military planes. At the moment the Egyptians have French, Russian and US planes none of which can talk to each other, all require separate pilot training, all have different spares and will require that maintenance/repair staff be separately trained. Each has different arms. Assume that costs - particularly operating costs - would be 30% higher than having an integrated fleet.
No country in the world has such a mess - not even the biggest lunatic asylums in the world. If you did that in even a 3rd rate place you would be fired because - to put it bluntly - its a less effective fighting force and threatens the nation.
In the last few months their purchase of the dreadful Dessault/Raffaele - that hardly a country in the world has bought - his a rock with the US saying that their missile/part of the Dessault missile could not be supplied to Egypt. Marcon raised it with Trump and Trump told him to go....
http://defence.az/en/news/124695. The claim is that the US has a worry about theft of technology - I think its a pretty clear statement that the US doesn't trust Egypt and this is further confirmed by Egypt's exclusion from the game changing high technology F 35 - which Turkey will have and Saudi and the UAE are demanding/begging to have. On the French fiasco what's the betting Egypt will take the plane and try to marry it with some Russian garbage - a bit like tying down that jeep on the deck of their new carrier and using its 2 dollar missiles to protect a 500 million dollar ship.
Their multiple types of ships that can't talk to each other (and no one else buys because there no good) and the very ordinary 6 (maybe

German submarines (no one else buys them because they are no good) just continues the Alice in Wonderland Red Queen madness and waste on a pharonic scale.
Even the Mig they buy from Russia is not the best and designed for different conditions. Apparently the US F 15 and 16's they buy by the score are not the state of the art versions/high technology and some commentators have suggested that their pilots aren't up to much - something the Saudi's and UAE would agree with over the past 2-3 years in Yemen.
Consistent, logical, evidence-based decision making isn't something you expect from someone with manic depression, amphetamines or an attention span, as Thatcher said, of a gnat on Benzedrine. Given they buy lots of toss offs/no one wants them maybe its more Steptoe and Sons.