And there is always this:
All it takes is for a significant injury for one of their key guys. I am not wishing an injury or anything like that don't misinterpret me. But injuries are part of basketball and many playoff teams were afflicted all through the season and unfortunately at the end of the season. All the teams you mentioned had such injuries. Clippers had Blake injured through the season, but they survived it. Rockets had a huge assortment of injuries TBH and while I am not a fan of that team at all, it made the case for Harden's MVP more compelling. Spurs, we all know about December 2014, and so on...
I dont think that the Warriors can go through an assortment of injuries like the Rockets did and have MVP Curry carry them by himself with a bunch of dudes TBH. If anything the Warriors best luck last year was that they were healthy all year and their minutes were well managed. The guys who got hurt, Lee and Bogut, they could play without and did. I am not discounting them though. It is always foolish to discount a potential tough rival, but I agree with your assessment, they are not so dominant as to be without question.