Improved pirate ground invasion

In one game, I finally decided to use the purchased ships and the corresponding option "privateering". And I was disappointed. Just one tactic without effects, only an infantry troops without upgrades, all this in the end looked useless.
So, here are suggestions on tactics:

So the main objectives of the pirate raid - the robbery or the destruction of improvements. While the troops are on the planet, they accumulate the looted wealth and engage in battles on the initiative of the defending (as seen from the tactics). If the raiders destroyed the defense of the system, the system does not capture and the hijackers receive an increased bonus to looting. While the loot was not removed by the forces of the raiders, the defenders have chances to repel the loot with the help of the appropriate tactic, or completely destroy the enemy. On the following pictures screens the pirate raid.

As I wrote before, I try to connect ideas with each other. Here you need an explanation, it's after the picture.

      This is the unit that I propose to allocate to all independent pirates and ships under "privateering" option. As you can see, evolution of mercenary unit is too long. Time is reduced by the number of active wars, combat encounters (cosmic and planetary) and total number of "manpower" in the galaxy (maybe even from events). Development of military technology also has an impact. In order for the technology to work, 75% of the empires must study it. As soon as this happens, timer will turn on, after ending of which technology will begin to operate on the Raiders. If the remaining 25% of empires study technology before end of timer, technology will begin to influence immediately. Here is a picture of Raiders.

Links:

General thread -  Various ideas, more ideas in future

Other ideas:

"Biological warfare" concept

System invasion rework

More "hotkeys" and keys combination

Consequences of a long siege and using "preemptive bombing"

Population composition of troops

Shadowmarket