Agreed. Considering the title of the game, I believe the original intention was to provide each of the main love interests a love and submission path while the secondary character arcs would be more linear. Of course, this has proven to be easier said than done and I'm not sure it's even reasonable to expect each path listed to get meaningful content anymore.
Btw, it's even more robust than what you listed above. Not only does Caitlyn also have a sub route, Carol currently has 3 paths (love, voyeur, tag team) with a near certainty to get a fourth with submission. No way it isn't at least planned the widowed wife of the guy behind all the sub antics won't get involved with that type of content in some fashion.
Not to mention with a somewhat large cast of females there's prob more threesome routes planned in the future. For the benefit of the game, trimming some of the fat might be a necessary evil here.