how come undertaker doesnt talk anymore?

Because he turned to the dark side.

I get what you mean, even in the past when he was his dark man gimmick he would talk except for when he first came out in the early 90s. Maybe the WWE fails to realize that a gimmick can't be the same after it's been tarnished. Taker has talked in the past before plenty and has had horrible make overs like the biker gimmick so now he should be the scary dead man but cut some cool promos since he will be retiring soon.

When he talks it doesnt give the full effect of him being this unstoppable force or a dead man walking they tryna ta portray him as a zombie like person n zombies dont talk thats proably why

Because the undertaker is to cool for words.

its beacuse when he became the dead man his ego is more of a no tak just wrestle character. he sometimes talks and will probably talk after his next ppv against edge because of all the controversy

His gimmick is suppose to be a quite scary kind of dude!

Because it would mess up his character. He used to talk a lot because he wasn't the "dead man" he was the "American bad ***."

well he didn't talk at first. he used to be silent and let paul bearer do all the talking for him.

i guess he's trying to go back to his roots?

he does talk sometimes but whats there really to say, and i think its supposed to go with his gimmick the dead man?

Because he doesn't have his biker gimmick anymore