The concept of 'complex engine management' doesn't necessarily include the crazy overheat issues...
Frankly, the CEM is neither truly 'complex' nor more 'realistic' than compared to AH, and it is more of a bunch of arbitrary selections among all the real-life pilot workload that is simplified into one or two extra keys to press during flight - which gives out an illusion that one is actually 'managing' the plane in someway.
...
However, I dig the illusion.
In retrospect, getting used to the CEM in IL-2 was no biggy at all, but it did give you a few fingermashing moments which was quite entertaining... and it also gave out an individual feel to all the planes - the VVS planes require a bit more manual input than others, the early US planes feel not much different at all... until the arrival of mid/late war planes, which feel a lot more advanced than the earlier variants... and the LW planes feel very comfortable and advanced from the start, being equipped with the [supercharger-mixture-throttle-in-one] controls.. and the Brit planes feel... well.. eccentric..
I don't support the CEM because it's more complicated, or because it's more realistic - I support it because it provides cool immersion factor without really making things too difficult. It was a clever implementation with a lot of good compromises. I mean hey, some people still believe that CEM is 'realistic' or 'complex' - that's a good indication that the clever little 'trick' for immersion actually worked in IL-2. It's a good idea.