Hey parts vendors, how about INCLUDING A DECENT SET OF INSTRUCTIONS in with the products you sell?

True, but A) I can return the item and B) if I have enough dealings with whatever random company I'm not happy with, they don't get my money anymore.

You're right, many companies make outstanding quality parts that may or may not include instructions. Might be worth it, might not be. But if I'm buying some obscure aftermarket gizmo and the company just "expects" me to know how they intended it to be installed, shame on them.

Car stuff isn't IKEA, most systems are pretty much the same and everyone modifies their car differently. Trying to cover every way in which someone might have modified their car prior to the latest gizmo is simply more work than it's worth.
Documentation costs a TON of money. Lots of smaller shops simply cannot invest in good instructions. Expecting someone to know the basics isn't too much. A first time install will always have a learning curve and trying to eliminate it is a fools errand based on my very extensive experience on the matter.
If the average person wasn't so below average it would be easier to provide instructions
:rofl: