Sacred Haven of Debauchery

That's a weakness, not a strength, because your fleet is tied down and can't operate further.

Nothing like that, you can fly away whenever you want. The enemy cannot resume production whenever they want.

And what was the point of the phrase about horses and sabers? Charging with sabers against tanks is a suicidal maneuver. Suppressing ground resistance and establishing an occupation regime is a military necessity.

The phrase is about outdated methods of warfare. Even now, we increasingly see that major powers prefer bombings (of various Syrias, for example), and don't send in soldiers very often. Over time, and with such advanced orbital bombings, the trend is unlikely to decrease.