While I agree with the article itself, some clients I had a misfortune to work with, really are from hell. Especially the sort that comes up with criminally bad UI rules and even after I spent days trying to explain why that would be detriment to their business, they keep insisting on it. So I build it and after 6 months they come back "GA tracking shows up that our registration process is completed in less than 10% of cases. This is really low, you need to do something".
Yes, I do, I can yank all the shit stuff you made me put there in the first place.
These kind of clients go hand in hand with http://managersfromhell.com/ which have no idea how to stop them doing that crap from happening.