they didn’t know how to fully apply all of its potential.

For some period of time they did.

It’s just that when all the civilized world in some relative measurement of it is one big centralized bureaucratic state, degeneracy starts.

Why make cannons if you don’t have a problem to be solved with those? Why even think about something like cannons?

Look at guerillas and combatants using FPV drones and the ways they do it, do you see developed nation states embracing that revolution? No, they still go for big expensive modern artillery, jets, big drones etc. It will be fun to watch the dynamics of power in coming decades, since stagnant rich militaries are very resistant to change and reform.