I agree there's much more sea floor than land area to use, and that it gets 'renewed' faster than continental land masses. On the other hand, we know so little

I agree there's much more sea floor than land area to use, and that it gets 'renewed' faster than continental land masses. On the other hand, we know so little about submarine ecosystems - what might be important in sustaining humans, what isn't, how they get damaged, recovery times, etc. It seems much harder to get that info from sea bed sites than from land sites. Complicated decisions with no apparent easy choices.