IPv6 necessary? recommended? or don't bother?

I have one question: if you recommend against attaching any IPv6 IP addresses, why there is nothing done to handle it in proper way? My VPS provider e.g. is not offering the possibility to disable IPv6 and so my MiaB server gets an IPv6 IP assigned.

I just disabled IPv6 in Ubuntu and that broke my MiaB server. It was not possible to start dovecot and nginx. Fortunately I found the following topic with a solution:

But with the next update the changes will get removed and I’ll have to do it again?