

I don’t think that’s the case, but trees in general are sadly not common in American landscaping, at least in my experience with urban areas. You tend to see newer (90’s+) homes with very small trees that suggest the idea of nature without providing any shade or other benefits. I keep hearing about people buying older houses with big lovely trees and having them immediately cut down because it’s disturbing the driveway or they’re afraid of it falling in a storm. I think insurance costs may have something to do with these concerns, but it’s really sad regardless.
In California they’re constantly giving out these little saplings that will grow into very functional and deep-rooted shade trees, but no one wants them because they aren’t pretty and drop needles.
I think the idea was that he could be invoked by his name, but they couldn’t have people going around saying “Jehova” (or whatever) randomly without any cool powers happening, so they made up the rule to discourage people poking holes in their flimsy story.