Edit: Basically, the only situation (post 2.8 or maybe even 2.7) where I can see killing off the cults being unquestionably beneficial is if you can muster the troops to take their HQ once, with difficulty, yet cannot kill tier 1 mansions on the regular or are so overrun with them you need the break to take 'em all down.
so im running 2.7 and ive been takeing screenshots in frustration and took out the 4 starting cults mid 1999 ( im running a bit slow because of manor spam ) and taken out maybe 20 manors in my current playthrough so far only having maybe 5+ active atm,
and i can tell you that the HQs are
Significantly easier then the manors. my manors are starting to have 80-110 units vs the HQs 70-100 but theirs alot more reasons why much harder
- reinforcements tend to shoot your units on the turn they spawn in even if your units are looking at all 4 of the corners to spawn getting off free hits. also they have pretty good night vision so its not hard to nab free spawn hits at night
- reinforcements elite soldiers often seem to make around 50% of the units
atleast in the late manors according to the elite badges i get after raid . and they spawn throughout the raid. making them a bit harder to P A N I C C A S C A D E . unlike in the HQs where i was generally able to panic most of the units within 4-5 turns
- migs
i think the spawn distance is only 10. and if you cover all the spawns they just force spawn even if your troops actively see them spawn. so i watch 3 corners and mid building and smoke the last corner one and that helps out abit
uh my monthly score is 2000-3000 only cus i take out 2-3 manors a month pretty much ironman now. but in mid-late 1998 i had to do alot of save scumming on the missions because i was having to fight manors that had 98 units with my OSPREY and basic armor vests with non bio enhanced troopers with black ops rifles and antipersonnel mines. or my score would be -1000+ ( i quickly realized i had to hard beef everything and eventually got it undercrontrol after alot of pain )
but with the new update im hoping they are more balanced and not rapidly evolving with huge troop counts because id rather fight muttons then manors lol