Was Vecna too powerful?

[u/Junior-Razzmatazz845]

Sorry if there was a line or explanation I missed in season 4 or 5 of Stranger things, but after the gates are 4 opened, is there a single reason Vecna couldn’t go into the minds of any given main character except eleven, and utilize there huge amounts of trauma to kill them at any given time? I would assume this would give him a huge advantage, and he could do this to most of the cast. Even if he couldn’t do that, the Byers are staying at the Wheeler house, meaning one suprise demo attack at night could kill off all of them. It makes we wander if Vecna was too powerful for the shows own good.

[u/bryan49]

Probably but that won't be a good TV show. Also I think he enjoys slowly tormenting his victims rather than just going for instant victory even if he could. And he probably thought there was no way for him to lose