I just think they dont want to go straight to the BJ, cunnilings or sex so they just tease you with handjobs and fingering. But that is just my tinfoil hat theory.
For some time when i was starting with VNs i didnt even noticed there were ratings. And nowadays i dont really care, since i can enjoy even badly rated games.
I think simple sandboxes are fine, but if someone tries to make me plan the whole game week, and basically grind for everything then i am out (or i just download full save ofc).
Depends. I dont have problem waiting for a whole year if the update is big and good enough. But if i have to wait 1 month to get 20 images in the update, then no thanks. So basically i would say the time waiting should be corresponding to the content and its quality in the update.