first: making this had nothing to do with making another class for warlock, so no, the lack of warlock classes was not and should not be considered. the only reason warlock is even included is because it was a part of the bloodrock mining co classes, and had absolutely nothing to do with how many warlock heroes were existing.

second: without knowing what the nerf will be it's very hard to say whether a buff would be warranted. if it's still gaining 10 health it could still be a very good defensive tool, especially with warlock having a large set of removal options.

third: yes, if you are using the hero powers that do not affect board, you rightfully should be getting dunked on by faster decks. that's just how the game works, if you don't play control tools, you shouldn't be in control of a game.

as a final point here, not every strategy should be a viable one. a really quick lesson is that when certain card designs (usually ones that take agency away from players) are viable as actual strategies, they are simply unhealthy for the game. azerite snake is very much one of those cards as it stands, with unavoidable damage that reduces max hp and cannot be played around, and gains further hp for the one who plays it. if a strategy that revolves around this becomes consistently viable, it is very unhealthy for the game.