This is true, but it's not my problem as the viewer. There are many more shows I'd probably enjoy than I'll ever have time to watch. I'm not going to prop up Netflix or other corporate backers that repeatedly fail to respect their viewers by not wrapping things up reasonably neatly.
If there was enough doubt about whether a show was popular enough to be renewed that the production team didn't know whether to wrap up neatly in a potential final season, there is probably enough popularity left to justify making a mini-series or "TV movie" to finish things off with some closure for viewers. I've known a few shows do this over the years, and IME it almost always gets a favourable reaction from fans and reflects well on the show and those behind it.
If there was enough doubt about whether a show was popular enough to be renewed that the production team didn't know whether to wrap up neatly in a potential final season, there is probably enough popularity left to justify making a mini-series or "TV movie" to finish things off with some closure for viewers. I've known a few shows do this over the years, and IME it almost always gets a favourable reaction from fans and reflects well on the show and those behind it.