Ah yes, the good old authority ploy... followed up by:
Which ignores the blindingly obvious difference between a table or chair and a tripod: on a tripod, you can adjust the angle and length of the 4th leg.The problem with four legs is that at any given moment in time, three of them will be in one plane (by definition) and the fourth....well...very likely will not be.
Another huge but not quite so glaringly obvious difference is that particularly outdoors, it's quite common to be placing the tripod on a surface or set of surfaces that aren't even close to level, so I end up adjusting the lengths and angles of each leg independently anyway in order to get the tripod to a somewhat level state.
Whether or not the quadrupod will turn out to be a gimmick or a benefit I can't say, but seriously it should be very obvious that the chair analogy doesn't apply here in any way, provided that you remember a little bit about your basic geometry.
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