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Is there really not an electric kettle that can be controlled in single digit increments and heat to lower temperatures like 85 or 90 degrees F? What am I missing here?

I think theres actually a fair amount of electric kettles that can do that? You just cant buy them at a regular store - gots to do your research! 

This is my favorite electric kettle I’ve ever owned, I just quickly checked and i believe it does 85 or 90! It’s a specialty tea maker kettle! https://www.breville.com/en-us/product/btm800

Also you specifically asking about the 85-90 degree temp range reminds me of heating formula or breast milk (for babies) which there are tons of products designed specifically for that!

I dig old computers and used bookstores. 