Is Conflux a broken castle?

The Conflux, in my opinion, was created simply for variety and for the Armageddon's Blade campaign, but this Castle is not balanced for champion-level play. Take, for example, its first two units: the Butterflies have a large growth rate, an unblockable attack, high speed, and they fly, and the Storm Elementals under a blessing are just overpowered. In short, it's the best starting development. The 4th and 5th level units are among the worst, but this is more than compensated for by the 6th and, especially, the 7th level units. The Phoenix is the fastest unit; it's not very strong, but it's tolerable, and a growth rate of 4 per week is, frankly, a cheat. Such a growth rate outstrips any similar growth rate in terms of time for any other Castle. Then, the Grail provides too good a bonus in combination with the ability to learn any type of magic in the university. Finally, there are heroes with stats of 0, 0, 3, 3. There's one female hero there with a specialization in magic, specifically the Arrow skill. 60 damage, 7 times per battle – that's 420 damage; you can easily take down a crowd with just one Butterfly. In short, in 90% of cases, this Castle has Phoenixes by the second week. So, when you happily buy your 3 Red Dragons on the fourth week and emerge onto the surface, only to be met by 10 (!) Phoenixes, you realize that you were wrong. So, my IMHO is that this Castle is not for player-versus-player games, but rather for playing against the AI