That only means Priest is not as popular and most people aren't even trying or experimenting with it.
No one wants to try and fail, they just want the decklist that will get them to rank 5 or legend without thinking. Whenever you see guides for legend decks posted or whenever streamers hit legend with something off meta, what do people say? "Ok now give me the deck code." No one wants to think for themself, they just want the decklist. They don't want to think about tech cards or what's good and why, or what their local meta is, they just want to be told the exact decklist with mulligan guide.
Priest is absolutely viable.
Not everybody has the card collection to experiment and play around :(.
Not everybody has the card collection to experiment and play around :(.
Learn to play around Scream instead of hating it.
Only person playing priest right now is Zetalot.