Earlier quoted context omitted.
But there is no conflict, no interest, in exploring a building site. What are you going to talk about, contractors installing pipes? How they get the best canteen food? It's actually better for the Death Star to be unseen, so that its full horror can only be imagined - and hence, becoming greater - in our minds.
And as has been explored the economics don’t really make sense.
But real-world warfare history is full of these expensive disasters that, in hindsight, were spectacularly dumb ideas.
I don't think the Death Star was meant to be practical. More of a terror weapon or trump card, akin in some ways to nuclear weapons whose true value transcends their practical value. The destruction of Alderaan felt like an allegory for Hiroshima and Nagasaki.