What bugs me more than the adapters, is the design of most window defroster vents (which is related to how the wipers work). This is something most people don't ever notice, and something that isn't an issue 99% of the time, but when it is an issue, it sucks.
What you usually get is a defroster vent that's like a foot long, then there's a gap of a few inches, and then another long part, and another gap, and so on.
The problem is that part of the wiper blade rests over where the gap is, which causes an issue in the winter when it's cold and snowing out. The wiper will have a section (that coincidentally lines up where this gap in the vents is) that doesn't wipe properly, and you'll end up with a white crusty smear right in your line of vision that you can't get rid of, or worse a section that starts freezing up that causes the entire wiper to quit working.
It seems like I might be the only one who has ever been effected by this phenomenon or cares about it. They've been making vehicles for over 100 years, and nobody's figured this out yet? How about we make it so the warm air can blow across the entire length of the wiper blade, is that too difficult?
OK, rant over. Thanks for listening.