That first link seems to talk about voltage swings, not frequency changes, doesn't it? I do understand that the loss of rotating interia in the grid generation

That first link seems to talk about voltage swings, not frequency changes, doesn't it? I do understand that the loss of rotating interia in the grid generation mix is a concern long-term. (See concerns from a report like https://www.osti.gov/servlets/purl/1854457 https://www.osti.gov/servlets/purl/1854457 ), but I hadn't seen any charts showing that we were less frequency stable than in decades past. I don't get how the latest inverter from Enphase is a specific solution. What does the IQ8 do to help grid stability? I'm legitimately curious. I know many inverters do some kind of frequency -control for curtailing power output, is that what you mean?