If you need me to explain why it's nonsense, I will. Initially, the Fortress was created with the goal of improving its creatures WITHOUT building an upgrade structure. And that was the point, and that's why it has great value! Why would I upgrade creatures in the Fortress when, by the time they're stationed there, it's unlikely that upgrading them from THERE will be worthwhile? It doesn't give any tempo advantage, if we refer to your words. But upgrading a creature on the FIRST level – that's TEMPO.
It's as if you haven't played the game for more than two weeks? In any week, in any place, a healing Fortress can be useful, even in a battle of noobs, so you can teleport later. Please don't talk nonsense. This is objectively a normal part of the game that has been destroyed, which is just not familiar.