I want to ask specifically why playing tight is good ?

In GTO Wizard preflop, there is an EV, for example, if I fold a hand that opens with an +0.01 EV, do I ONLY lose 0.01 ev ?
Or does my EV decrease when I have AA, KK? (If my opponent doesn't 3-bet lightly because he thinks I am tight)

in other word, even if GTO Wizard opens 100%, the ranges of 0, 0.01, and 0.02 ev do not need to be opened?

I really don't know..
I want to play tight to make my life easier, BUT I'm worried that if I do that, my EV will decrease when I have AA, KK.

Any opinions are welcome, so please leave a lot of comments, friends :)