But why are "secret" quests like the Old Scholomance / Naxxramas stuff designed this way?

[Lysende-arathor (Lysende)]

Ok, I guess I was not 100% correct.

From another thread:

@Deveón-laughing-skull

Blizz didn’t announce it’s return, it was datamined. It was a secret for the players to find, and we did.

So yeah. Too bad now “secret finding” isn’t in game and discussions and theorizing based on vague clues, but rather just looking at the data when it’s on the PTR.

Still, I think Blizzard should be mindful of that. If any content is found immediately when it’s on the PTR, they might as well just include it as a regular questline, even if a hard one.