I have to second you on this! That ATM there is more content for NTR/Voyeur routes is even acknowledged by the Devs and they already stated earlier that some updates will be more for Alpha, some more Diplomat, some more for Betas. Case in point the nextupdate will be focused on family interactions.I'm not. I agree that the content is tilted towards the NTR path at the moment. I disagree that the game is content-free for people on other paths. I think impatience is never a virtue while reading a story.
"OMG, she's totally banging that black dude!" if you can avoid it isn't a reason that the alternative path must include commensurate content. The starting state of the MC isn't exactly a secret. He's not going to be impregnating the island the day after he arrives.
As for content on non-Alpha routes, I played a bit with various diplomat routes, focused on Mom and Sis. I got over these routes, partly as told before, a handjob from Mom, Kiss from Sis, playing with Sis´breasts, blowjob from Sophie, blowjob from the coffee shop barrista, dream about Mom or aunt and some breastplay with the Aunt. And I am rather sure I did not get everything on these routes. Yes, that be "less" than what you might see on the voyeur route, but it shows that there is content for the other routes.
And the choices you make do make a difference. There is quite a variance how the diplomat routes turn out. That is great!
I think sometimes that the super-alphas did just a single playthrough, did not get their choices right and now sulk.