I've definitely known a few people who have used their diagnosis for a mild cognitive disorder as an excuse to exhibit it's negative symptoms. Knowing how to and proactively managing emotional and motivational responses is one thing, saying "I have ADD" and using that to be perfectly happy watching Netflix all day instead of doing your homework is entirely something else.

And I totally agree. Some people are given wrenches, other people hammers. The solution isn't to make people really good at tightening bolts with hammers.