There are certainly pros and cons to this kind of thing. I guess I remember a lot of the reasons given back in AW for it. There, in the scenarios, there was always the gripe (well not always but lots of times) that one side or the other had the better deal in aircraft, situation, assignment (attack or defend). Truth be told it was true, due to historical considerations.
So the switch meant you had to prove your outfit capable of playing whatever hand you were dealt.
I guess my group always looked at the "mission" as a challenge. Could we pull it off, given whatever equipment we were handed? What advantaged did our airframe have and how could we utilize them? If I want to fly a particular ride I can do that in the main arena all week long.
The CO has the tough job, trying to use his mix of aircraft in a way that takes advantage of their strengths. Sometimes that is daunting. Late Pacific warfare always favors the allies since their equipment had surpassed the Japanese by that time. Late European war is more even but depending on the mix of aircraft in the particular event the allies can end up with a decided advantage there too.
That's however Macro... in the Micro, small unit head to head conflict the tactics can overcome those disadvantages.
Squad Ops is about organization and tactics. Manage to get 12 of almost any ride jumping 6 of almost anything and the numbers will tell the tale.
Hell, just getting your flight to the right spot, in the right formation, at the right time is a challenge.. LOL
Just my nickel's worth...