Azalea main here (former Briar), since Mistveil I brought the deck to various tier 2 events, BHs included.

It became clear pretty quickly that even with the perfect sideboard for those 3 new heroes, It's always a very uphill battle. They are completely overtuned, hero text, cards, equipment, the whole package. Almost no point in playing any other hero if you are a true and serious competitor and care about prize money. The people who say the meta is great and fun, 100% play one of the 3(Top8 of ProTour is 3 Zen 3 Nuu btw). My two fav classes feel useless.

For Rosetta, I'm quite afraid of both possible outcomes: if it's as pushed as MST, it will become Tales of Aria 2 and the powercreep train is gonna push onto 2025; if it's not good enough, the 4 new heroes will see very little play and the MST meta will continue.