Re: I have LetsEncrypt...and...
Yes, installing Letsencrypt certs on my main reseller a/cs is a P.o.P, but adjusting the .htaccess redirects to make sure it all works, and finding the odd embedded http reference in 10-year-old code is more of a faff, and when you have dozens of sites to work through, there are other priorities. It's also tricky to explain to a small customer why you're adding an extra £50 to this year's hosting bill for a brochure-ware site.
And sometimes not so easy on shared hosting packages.
I suspect I'll wait until customers complain, then upgrade convert to https, and charge them for the time.