Hopium take 1:
There’s no reason they’d reveal their plans to bring it to steam early and cannibalize on the epic store sales

Hopium take 2:
Even if they don’t have plans right now if they ever want some quick money to meet targets or something it’s the prime candidate

Hopium take 3:
When or if remedy starts making money (like from control 2) they might buy the publishing rights back

Hopium take 4:
It’ll run better anyways when Alan wake 2 remastered comes out in 10 years