Every game or visual novel and their different variants, develops at different paces, depending on the author/developer/creator making it... Some of them are milked for donations, from what I consider misguided paying fans... Some are just slow developing, due to various real life factors and/or developer skill... Some are quick to develop, using the money they get to produce better and faster developed products...
My preferences typically revolve around story based visual novel/games with an even amount of porn scenes/visuals but I don't mind if they lean towards more story then sex stuff, depending on the VN/Game... But of course, too much of an imbalance is in itself also annoying... There are also some grind style games that focus more on the sex stuff over the story, but at least some story elements are there, that I might also enjoy... If it's just all about the porn, and no story hardly at all, then I tend to refrain from those... If all I wanted was sex visuals and so on, I could go do a Google search for all the free porn the world has to offer...
As to actual examples of games I am waiting on full completion before playing them... Not really sure I have one... I do find myself, as time goes on, having the desire to wait for longer periods of time before revisiting visual novels and/or games I've already tried as they are developing... My preference would be to play complete VN/Games, especially ones I enjoy, and even more if they have various story endings to experience... But those are hard to come by sometimes... And I think that, sometimes, has to do with the plethora of unfinished works that are taking their sweet time to get to a state of completion... Is that due to milking, or just slow development, or just because the developers can't seem to end it and move on to the next project? It is probably a mix match of all that and then some...
If I see a developer is taking a long while to work through a project, like as in a year or longer... And the money they are receiving as Donations is pretty significant, and not commensurate to the development quality and speed, then of course I usually suspect full on milking, and will avidly avoid that work from there on out, regardless if it was fun or not... I don't support greed, with my money or my attention...
Of course, everyone would love to see their favorite projects get done as quickly as possible, so they can get their fun on... But it is the nature of this amateur based industry, to take a lot of time to get stuff done, most of the time... Would I wait a year or more before even playing this genre of game or visual novel? Most likely not... Regardless how good it is... That's a long time to hold out for something that may or may not even be worth the wait... I'ld rather play something already finished, or try something new and touch bases with it again every few months... Will that always be the case for me? Just depends on what I'm willing to do or not to do at the time... For now, that's been checking back every so often for VN/Games that I found I enjoyed, or I'm willing to give a second chance to... That could change in the future or it might not... Just have to wait and see...