This is a very nice piece that had so much information I did not know. Toward the top of the article I was wishing for footnotes, references or something that would indicate it was not just your opinion, but as I got further into the piece you provided so many great references. I thought the calculator manuals were particularly accessible and convincing. Thanks for a great read!
The city I live in has two big box stores. One has a retired plumber in the plumbing section. I’ll drive further to go to that one and wait patiently for his advice.