I know, that's why some refer to it as IAF instead of IDF.
As for holding defensive positions...it's mostly just a matter of time.
The Maginot Line didn't hold, as the Germans went around and came in from behind, and Eben Emanuel din't hold, Fort Sumter didn't hold, The Atlantic Wall and "Festung Europa" didn't hold, the Mongols bribed their way through the Great Wall of China, Hadrians Wall didn't help much, and the Golani heights didn't hold when IDF chose to take it from Syria...
So basicly a defensive position is just a stopgap in order to buy time to build up sufficient strength for a counterattack on an attackting enemy.
People who has been living and hiding behind walls, and relying on them for their sole defense have mostly perished.
Then comes the question, why would the IDF place highly mobile artillery units on the Golani Heights, if the doctrine of defensive warfare is rendered obsolete...
I know what I would answer if asked, but I can also imagine what certain people would think, and try to turn it into in a debate...
Better not feed the trolls.