Any company making these products and selling them for profit has to expect to serve folks who aren't experts or who may not have an engineering degree. The company's job will be to put their emotions aside and figure out how to help their customers get the job done, even if they're in "the wrong" to complain.

They don't have to accommodate this kind of customer...but they can also expect to go out of business pretty quickly if they don't. The narrow band of customers who are savvy enough to modify, weld in parts like this...but not quite savvy enough to make their own parts, will only take them so far.