Because small electrolyzers had only one fluid input and output, their recipes use cells if multiple fluid inputs or outputs are needed. What I request, is this Cell I/O to be converted to fluids internally, same as Large chemical reactor does.
I understand that there might be complications with recipe lookup, because which fluid to convert to cell, but I just want to make this feature request.

I guess I could do it for the centrifuge and electrolyzer.

Done in 6a86f38.