so far it's impossible to say they have warped. LIke I said earlier pretty sure mine wasn't perfectly level day one. Also read back in this thread a page or three for my reply to a video for the part of the video one might want to watch. IT contains an explanation for why your Switch might not be perfectly level.
Yes there are probably other explanations too. We agree that it is not a problem yet but there is no harm in people being aware of it. If some people here take a few mentions as a epidemic then what are you going to do? Not like anything would convince them otherwise.