Infrastructure without permanent residents is meaningless, and normal development of infrastructure without normal population growth is unprofitable.

Infrastructure is an indispensable element of a large community.

The Decepticon capital was most likely equipped with several levels of defense, I'm afraid to imagine the damage and losses of the Autobots during the battle in Kaon

All important infrastructure is located in the capital, it is not surprising that Kaon is the center of technology, industry and culture, as well as the largest meeting place for prominent and important Decepticons.

It engulfed the entire planet, but when its fire died down it turned out there was nothing to save, everything was burned.