Right now we're 8 inches low in the front of the 24.1 and the fridge is working just fine.
I'm not going to say it's an old wives tale, because it isn't. I'm going to say it's a fish story and the fish/angle just keeps getting smaller and smaller with the telling of the story.
I think 'level' is very over rated.
(there are 40 or so leveling apps. Some tell you within a tenth of an inch which corner to raise)