BONUS: I find the Y/Y overlay of Organic Keywords also interesting. The more I use it, the more it seems to validate a theory I have never confirmed: Is the Semrush scraped keyword database is not static?

For practical reasons, I imagine it isn't. That would mean the "floor volume" (say, they only track keywords with > 10 clicks/month) cuts off at different places at different times of year: resulting in a seasonal trend in an unexpected place.