I see what you're saying and all, but I don't think that the not-making-real-sense thing has to be the reason. And again, it very much depends. A show like Twin Peaks obviously doesn't have to make complete sense, in fact "“ it shouldn't make complete sense. But that's not saying the not-sense-making can't be taken too far.. 'cause it most certainly can. I'm just saying that most of the time that isn't a real problem for me. It can be, if it feels like they're creating new "unrealistic" things just to come up with something new or just 'cause of laziness. But sometimes it just doesn't matter at all, or might actually even be a way to make the show better (again "“ as long as not taken too far)..
EDIT: But on the character thing I really agree. You should almost never give up a character's real personality/characteristics/whatever just to be able to tell the story you want to or something like that..
Aww man, I could gab about this for days!!! Fun, fun, fun... you're right about Lynch. He's one of those artists that often intentionally doesn't make sense. He's often just going for a mood, or just a general intent to disturb. In fact, ABC destroyed Twin Peaks by messing with the show"”demanding that things be "resolved". Much of it depends on genre and the intent of the artist. A conventional murder mystery, if filled with plot holes and logical gaps, usually just leaves you pissed off.
The Simpsons, as another example, is basically all about messing with character and conventions. It's a satire, so it constantly plays with its characters' behavior and even its own internal cartoon logic"”all for a laugh or some comment on society.
And as far as art and limitations in general"”that's probably personal taste to a great degree.
But just listen to Joss when he's explaining his prep work for Wonder Woman. He's continually describing things that he will NOT do, will NOT have in the movie. You pare away all the superfluous junk, you intentionally box youself in with limitations, so that you have a firm, credible foundation and walls in which to bounce your characters around. It generally feels like more satisfying drama for characters to exist in a universe with rules and restrictions (to me).
A watercolor painting, a haiku poem, a 3-minute pop song. You can tweak those conventions, play with them"”bend, break the rules. But, I think it's good to have rules in the first place to bend....and there are also nearly limitless possibilities and variations within those confines.
Just thinking back to school. I had one painting teacher that said, "just explore, do whatever you want this semester and we'll have a couple of critiques". No technical training or advice whatsoever. It was fun, relaxing, but I just did what I was comfortable with, didn't learn much of anything.
Then there was another class. A drawing teacher. We were allowed three objects. I got a brown paper bag, a piece of rope and an onion. "This is gonna suck, big time!" I thought to myself. So many limitations! We explored every aspect of drawing with those objects: shape, value, negative, postive space, variation, repetition, etc...By working that restricted way, we learned of new ways to express ideas"”created more tools to explore the world with art! Our ideas were actually freed, multiplied, made much more sophisticated...by the end we were exploring themes of spirituality and emotions with paper bags and onions.
And that's why I tend to think that "post-modernism" is a two-edged sword. No restrictions, anything is possible. So, you have to define your own restrictions to create emotional reactions or "meaning" with art (if that's what you're trying to do).