New readings of Venus' atmosphere are telling us that its volcanoes are not exjecting more water into it. Volcanic gas is at most 6% water.
Mars has ice under the surface (and sometimes on it). Earth has enough underground for a true Noachian Flood. Our volcanoes blast much water upward. Some of this is mediated through tectonics which push the ocean's water back underneath; Venus doesn't have tectonics (supercritical carbondioxide apparently not being much of a lubricant).
Venus is looking like, not only has it lost much atmospheric water, it never had much on the surface either.
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