I don't even know where to begin... so, I like reading, a lot. and I think this is a really stupid comment. I read constantly all sorts of things and 99% of the time they are partial things; some academic paper, some weekly fantasy series that go on forever, books, websites, whatever!
There is not particular harm done if someone can't finish a story by themselves, I have read so many stories (and all of tvtropes) that in my internal world all these different stories come together. You read one story like song of ice and fire and then another one like the first blade and then another one and another one and another one and eventually you see how they play out and what can happen and you learn to enjoy the glimpses rather than getting all huffed up that the author didn't put enough into it.
Seriously awful to be in a society that is so entitled that you can get top comment on the heading "Entitlement issues" with such an entitled comment.