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Conflux – a cheater castle? No way... There are no cheater castles; there are just good and bad players. If we consider Conflux as a castle, then the good magic of this castle is compensated by its weak units.
I don't see anything strong in the fairies – they die like flies.
Storm elementals – yes, they are the strongest creatures of level 2, but they only rule at the beginning of the game, and besides, they are vulnerable to lightning, which can help a lot. For example, archers from the Castle can perform just as well, in my opinion.
Firebirds and Phoenixes rely on quantity and speed; this is basically a strong point of the Conflux, but there are also effective ways to fight them. After all, in terms of quality, they are inferior to all creatures of level 7. And they can also be taken down with magic...
Although the Grail's effect is the best in this castle, I doubt that it is found very often.
The University is a good building, but again, it doesn't give any super advantages.
But I didn't understand anything about the cheater heroes at all; why are they cheater heroes? For me, the heroes of the Necropolis with the Necromancy specialization are much more cheater-like.
Therefore, from everything said above, it follows that the Conflux is not a cheater castle at all. I repeat, there are good and bad players, and in most cases, the outcome will depend on the level of skill, the correct tactics, etc.