Question in the title. What justifies this additional effort exclusive to the SU27 ?
As far as i`m concerned there is no engine modelled inside nozzles in Su-27 but they are indeed connected to each other
Yes, there is indeed a difference inside the nozzles of the SU-27 compared to others. I’m talking about the types of circular grilles at the very back of the nozzles. I don’t know the exact name; I’m not an engineer. But on the jets in Warthunder, it’s a jpg image that we can see when activating the afterburner, whereas on the SU-27, it can be seen even without afterburning (though less clearly, of course), and it’s clear that it is modeled in 3D. I hope I’ve expressed myself well!
They are calledd flame holders, they prevent the afterburner flame from being blown out. Many afterburning jets have it modeled but you can’t see it on a lot of them because they are almost black and normally there is not enough light inside the afterburner (the Su-27 is one such case).