After listening to your feedback, testing on my side, I decided to return the armed rogue spawn rate to its vanilla value.
However I keep the quality improvement of the rogue armies.
So after experience, I confirm your point of view.
Armed rogues could have been a good idea, but they were poorly implemented by CA.
Let's see if they rework it in the future.

-While waiting for a more general opinion from the community, I have reduced the rogue army spawn chance value by half
-Fixed where the AI ​​retreated when attacked even though it had enough strength to win on auto resolve

-Fixed a bug where some factions sometimes stopped recruiting.
-Adjustment of value judgment (always to find the perfect value)
-Correction and adjustment of the value judgment of minor colonies where the AI ​​besieged while it had vast superiority.
-Other minor improvements

-To try to make things smoother, I reduced the AI's opportunism from 65% of its strength to 60%
To make things more dynamic without the AI ​​becoming suicidal in terms of movement.
-I also tried a new adjustment to always ensure that the AI ​​positions itself better, even less suicidal placement and movement, I try to have the best result
-Increased the priority that the AI ​​attacks forces near a recently lost region (to force the AI ​​to recover its territories and prevent it from following straight ahead like a bus)

-Rebels have more units and armies
-The rebels have better quality units
-There is much more luck than army rogue pop
-The rebels and army rogue will be much more threatening and present on the map.
-the AI ​​will prioritize nearby threats rather than distant ones.
-It will be easier to make a peace treaty with factions much further away from you.
-I made sure to force the AI ​​to always be active.
-The AI ​​never ignored passive or rebel factions
-Maximum increase in WAAGH quality.
-Rebel armies will be quicker to make arbitrary attacks
-The maximum number of a rebel group has been increased
-Activation: When adding a horde to an existing group the number of hordes to split from the group (excluding the new horde) to use in forming a new horde group.
-Value increase: Maximum acceptable distance from a horde to consider membership - multiply on the median bordering inter-region distance.
-Reduced the minimum number of siege engines required for rebels to make an attack.