I guess this has most likely occurred for me as I play much more passively, as in I don't fully breakdown my stable. Rather, I just boost affection to max and work on increasing discipline. I get that not a lot of people play like that and it's probably making it more difficult for myself in the long run, but the mechanics of the game do provide it as a viable route and it was prior to 0.8. At least based on the Defiance page on the wiki, it shouldn't be scaling this high this quickly if they've got high discipline and affection, which is true for one of my girls, yet she's somehow managed to hit 17 in Defiance in a matter of days. Tbf, part of this was caused by the morning blowjob event which increase defiance if she decline, but the majority of it was gained purely from explaining chores. With regards to it being fuel for justifiably punishing your stable, I have tested the mechanic and it's always allowed for the bondage punishment system, however even with bondage and whipping sessions combined and using up my full stamina, I've only been able to reduce their defiance by one. I understand the chance is real low, but it kind of just leads to a scenario where you're more likely going to gain more defiance than lose.defiance is used as a "fuel" for justifiably punishing a slave to varying degrees and leveraging results in the way that you want.
however, i havent played around with it too much as my current stable of girls are already devoted and my head maid and quartermistress have traits that suppress that type of thing. then then "MoR Enhanced" came out for tier4+ subs, and ive been playing around with that.
Not really sure if this is cause they're not broken and not many people extensively play this way, but at least to me, defiance and corruption don't really seem to be "balanced" when going for unbroken, high discipline and high affection routes. With defiance, I can understand if it's added if the girls new. When she's at soulmate affection level and 70 for discipline, less so. The rate my stable is gaining defiance doesn't seem normal considering I have met the prerequisite of high affection, high discipline, assigning them tasks to keep them busy, assigning them titles, assigning them as maids, and keeping them at a healthy weight. With corruption, I just don't find the way it's added has made sense in my runs. I've completed rough sex sessions and bondage sessions with, at least based on the text, the girl enjoying it, but have more often than not received not corruption increase for it. In contrast, I was somehow able to raise it with pure vanilla sex.
Again, I understand I'm probably playing this quite differently, possibly even "wrongly", from most and I don't mean for this to be a rant of some sort, but at least from what I can gather from the wiki pages, the way defiance and corruption are being added in an unbroken, high discipline and affection playthrough doesn't seem to make sense considering the prerequisites have, as far as I can tell, been met.