Great post.

So a primordial atmosphere could have had a hydrogen sulfide atmosphere with sulfuric acid water for first beginning of life and after hydrogen sulfide was used up, a necessary change to carbon dioxide and sunlight[the hydrogen sulfide had been used up in biolife forms[primitive bacteria] and in sequestered [percipitated]in water/mud sediments.

Bioatmospheric terraforming on a grand scale perhaps.

But incorporating sulfur majorly into biomolecules is definitely fascinating.

But as I been taught on baut that would have to be carbon deprived solar system.