Maybe because the public understands better looking neighborhoods but has no idea of the efficiency of adding a wire. Just guessing.
And they shouldn't have to care about that. It's not relevant to pretty much anyone's life until the whining starts about how much new generation capacity may or may not be needed. Case in point, TX has two nukes that generate less than 20% of their power right now - noticeably less than wind power in the state!
Somehow the "clean solution" is to build more nukes...when all they have to do is add that extra wire and literally get two new nukes worth of power in the state! They could spend $ Tens of millions - maybe a few hundred million - and save $60 Billion!! (Approx price of new nukes.)
PLUS - NO EXTRA fuel costs!!