I need to say that your points aren't only completely wrong but they're also simple-minded and one-sided. This is almost certainly because you aren't knowledgeable about the series, so I will try to explain more about to you.
The only notable sexual motivation comes from the protagonist. Rance's world isn't about him assaulting people, in fact, the inhabitants mostly have an sense of justice and disagree how Rance takes these things, people think he's cruel or just really hedonistic but that's exactly why he's so special. The reason these scenes exist in first place is for
characterize him or some other character on the world. It's true, there's a relationship about his motivation and the plot, but this isn't nearly close of being the main aspect of the plot, just
give a look of how much things happened before he was ever born, H-scenes aren't even close to being the main aspect of the series. To be fair, I even watched some parts of MGQ gameplay on Youtube, and read about it's worldbuilding, as said by Aridwolverine, Rance is nowhere near sexual as MGQ. For example, monsters are extremely biased to a sexual side as
stated by the MGQ wiki and battles on MGQ have actual sex related options while the own monsters have sex-related attacks. I even read Illias page about how she treats the heroes and the moves she uses when battling against you. This is basically nonexistent during battles on Rance and even the assault option (that only exists on earlier installaments of the series) is not only completely optional, but only works on minor enemies and you even arguably have to lose doing it, as Rance doesn't gain exp from taking a opponent like that. In fact, battles in Rance are fully-fledged battles, people are actively trying to hurt each other through their own skills, so Rance fits really well on this wiki. Rance X have actual lore pages that
only exist for explaining you the battle style of the demons you fought, as their backstory and relationships, without any erotic content behind it. I could even post some to you give a look. I can safely say that Rance doesn't only fit this wiki as also there's many interesing aspects and abilities that could be creatively explored on versus matches. Rance is definitely a level 3 when comes to that.