I'll try to explain my "problem" here. I'm far from expert in this topic so...
I'm hosting a simple website on my DS923+ works fine. I've got a *.synology.me address registered. However since I'm not really into announcing to the world that I'm using a Synology "web server" (=synology.me) ...
LetsEncrypt will no longer be alerting people when their certificate is going to expire. You'll have had an email if you use LE.
Do I care? I have LE certificates on my Synology. Will they automagically renew - I think they do any way - or am I going to have to fiddle about when I fail to renew...