That's only your interpretation that it''s being ruined, a lot of people disagree with you. What is boring as hell to you, is not boring as hell to them. In fact, what you're advocating, is what may be boring as hell to them. You say that should only be the end game, but your statements suggest otherwise. Because you don't really want Laura to succumb to her dark desires. You obviously view such an outcome as ultimately bad, and you want her to keep struggling against that, to never surrender.
I don't personally believe that surrendering is bad, or boring. It is possible to create interesting and hot scenarios even if a character has already largely succumbed to her slutty inclinations. The corruption process doesn't just stop because the protagonist is no longer struggling against those inclinations. She can always slide a bit lower. The way you describe it, is like Anna for instance has already reached the bottom of the barrel, but she hasn't, she still has far to go. So why shouldn't that form the basis of a game, and why shouldn't it be interesting and just as relevant to those who enjoy such content, as people who enjoy the kind of outcomes that you prefer. It's almost like your suggesting they're idiots to not share your own preferences.
All I'm saying is, that Laura's actions do not make any sense, unless she's actively trying to resist BB. Now I'm not saying that there isn't a route, where Laura is following this pathway, because there obviously is, but surely on the submissive route this should not be the case. And on that route by now, she should have started to accept the new reality in her life, that humiliating and degrading sex acts can actually be fun, when you subvert conventional societal beliefs. But the Dev seems loathe to do this, and insists on Laura suffering the same woes, that she has on the other route where she's intent on resisting BB as much as possible, and retaining as much of her old lifestyle as she can. I'm not saying that that isn't a part of the game, just that the part of the game that opposes that (where Laura is supposedly submissive) currently often doesn't make sense, because if you're submissive (or becoming that way) eventually you stop fighting, and accept the new reality. And then you start to enjoy, what your old self might have once considered demeaning.
I just feel we've got beyond the point ( at least on the submissive route) where Laura should be continuing to resist ( at least with her inner dialogue). She should know by now, that there is no returning to her former life, because she likes being submissive too much. Once you acknowledge that, everything changes and you stop worrying what other people might think or the possible consequences, because you know it's inevitable and you have to restructure your life to accommodate it. Obviously, Laura will continue to resist BB to some extent ( in terms of discovering the truth about his organisation and possibly bringing about it's downfall), but as far as the changes to her sexual self are concerned, they are now irreversible on the sub-route, so continuing to resist them is pointless, as well as counter to her own sense of wellbeing.