Archipelago worlds build up atmospheric oxygen faster?

I've read super-earths might become archipelago planets. Picture shallow seas, under a thick atmosphere that alternates between muggy and clammy. Because a bigger share of the surface would be continental shelf, there would be more room for kelp forests and other habitats propicious to photosynthesizers, who get more light in shallower waters; so would it follow that an archipelago planet would have very oxygen-rich air and big arthropods to go with it?

EDIT: Presume there could be mats of green sulphur bacteria or some other kind of photosynthetic anaerobes covering those big, sunny, shallow shelves, and that my arthropods would be about like Earth's dead eurypterids. To be clear on intent: Would an archipelago planet get to some sort of "Cambrian phase" earlier in it's history than Earth, and would my pseudo-Cambrian animals be better off with having dry land spread out more instead of closely packed together like Earth's used to be.

Thank you by your answers so far.

posted over 5 years ago

aadv‭

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