I was pleasantly surprised by that, to say the least. The addition of two new classes instead of a single class for the expansion is very much the heartbeat I wanted to hear from the devs. This decision is no small feat as those classes will need considerable attention and support going forward.
My brother used to say that he was waiting for the Paladin before checking in on Diablo 4; it was his favorite class back then. But regardless of nostalgic factors or preferences, classes in general fuel RPG fantasy like nothing else, making the world broader for veteran players and more interesting for new players.
I hope this is not merely a one-time decision. Please keep that momentum for future class updates.