> Using LE to apply SSL to services? Complicated.

https://github.com/JessThrysoee/synology-letsencrypt

> there is very little one can do with this thing.

It has a VMM and Docker. Entware / opkg exist for it. There's very little that can't be done, but expecting to use an appliance that happens to be Linux-based as a generic Linux server is going to lead to challenges. Be it Synology, TrueNAS, or anything else.