Hi @arnauvp, and thank you for this detailed long answer ! 
That’s right, private users won’t probably need a load-balancer !
By the way, I’m curious : is it just a simple LB, or does it come with a WAF, like f5’s ?
The NC upgrade seems quite simple, the instructions you wrote are clear enough for an experimented administrator.
As I’m not in an hurry with upgrading my NC, I propose to wait for the guide and provide feedback on it.
What about other components (postfix, rspamd, mariadb, nginx, … ) ?
Best regards, and bravo for the ecloud.global upgrade 