It's not uncommon to crash or have bugs either, but that won't convince me to have more of those.
Or in a less radical example, it's not uncommon to dumb down interfaces to the point of hurting usability, but that won't convince me it's a good idea.
Or while we're at it, it's not uncommon to try and accommodate everyone's little UI preferences while annoying the hell out of other users, but that won't convince me it's a good idea.