Not 'easy'. More like 'necessary, so Elders will do it until they either succeed or are eliminated, and of those who succeed, their success will be better than Lookshy by the same margins as a Solar infrastructure-builder is better than a bunch of DB infrastructure-builders'.
Basically, it's a creation of a situation where Elders either maintain an island of 'Mild First-Ageness' in their Dominion, or get wiped out by those who are closer to such an ideal and/or those who manage to sabotage their infrastructure. People like pointing out how "this had to happen before the PCs started doing it", and that's what happens. Of course, if that ultimately does result in a "Elders got wiped out before PCs were created; game without Elders", that's not an inherently bad thing.
And why is such resistant infrastructure not having significant costs? Why is having such infrastructure even remotely possible without additional, non-hardened infrastructure?
Oh, right, because your ability to critically read and respond to a given scenario is about the same as the average housecat's.
So you're using an example that doesn't apply to the proposed situation while ignoring and disregarding all of the things that factor into the example's present state?Why do something that utterly moronic and without merit?It's largely an example of "Look, even mere Terrestrials can achieve this; now let's see how much better can a single Solar circle (or even a single Solar) get than that".
I mean, even ignoring the garbage of the 'mere Terrestrial' line, you're ignoring the principle advantage that Lookshy has over a Solar circle in a similar situation: 1000+ exalted rather than 5. Given the issue with infrastructure as presented is that having exalted be able to guard all points of attack is generally impossible due to the sheer number of points this numbers advantage is pretty critical.