We are agree on that, but:
1 - As "Domain" Do we need to add all the domains and subdomains used ? Or when we add a "domain" all its subdomains are yet included ? (When I install joomla + Seblod on a subdomain of a domain yet added on the list).
2 - Adding a new domain you wrote "If you want to authorize [www.domain.com] and [domain.com], you should create both. Do not prefix with: http:// or https://". So, having all www to no www (domain.com) .htaccess redirection setted (Frontend and also Backend), input the domain.com, no www, should be enough, right ?