You're thinking about it the wrong way. Despite a major hub of lemmy being down if you have an account on another instance you can continue using the network nearly as though nothing had happened. Individual instances may have greater or lesser reliability but the social network is very robust.
Lemmy is still alpha software, thrust into the limelight by the fall of Reddit. It is still in its infancy. Reddit has had over 18 years to get it right. So it will take some time.
Lemmy.world is super big AND being attacked constantly. Smaller instances don't have these issues and they are stable and fast. You can still subscribe to everything from Lemmy.world and your instance will remain up even when Lemmy.world is down.
I'm on lemmy.today and it's fast and stable. Come join us and you will see.
Basically use the fediverse the way it was meant to be used.
It's definitely bad if you can't use a service you'd like to use but one has to remember that this isn't run by someone with millions of dollars at their fingertips.
And the reason for that is simple: This service doesn't exploit it's users.
I was actually scrolling through to see if anyone posted anything about the outage hahaha. Do they make announcement posts to warn about an outage for Lemmy version updates?