Good article thanks!!
I see the part about buffering but in the context of the article, it seems to be more related to keeping the pH over 6.5 which is something we can manually do in aquaria via baking soda, coral etc.
I read it as: have an adequate buffer so that the pH cannot drop below 6.5
As long as my pH doesn't drop below this, there should be no requirement for a buffer.
An interesting hypothesis but I don't think that kH
actually does anything in relation to the process, besides keeping the pH stable (and, more accurately, not even stable but ABOVE 6.5) , which is something that we can monitor ourselves
It does mean that someone with soft water and no buffers will need to be more vigilant when cycling. When I cycled my 90, I actually DID have a pH crash and a cycle stall because I didn't know about this stuff.