Common IRC servers were not without problems. I think it was just more common to shrug it off and do something else until the problems went away.
Now, aws or cloudflare gets a hickup and half the internet is nuked.
The old internet was far more federated so doing something else meant to me "Welp, anandtech is down, let's go to pcper, digg, tomshardware, slashdot, etc"
Sure stuff would go down, but it would be just that small community rather than most of chat for the internet.
The more I sit down and try to remember how it actually was to use internet in late 00s, the only thing that always comes up is "there is no way people today would tolerate it nearly as well as we did back then".
I think the centralisation is the issue, I could connect to a different IRC network with a community around the same topic/game. When Discord is down there's nowhere else to go.
Simple services recover faster. Federated infrastructure is much more resilient. We had slower computers, more considerate coders, and simpler software; so everything was snappier, even with 56K modems.
For example, navigate to https://git.sr.ht/~bayindirh/. No scripts, pure HTML. running on a single server. Served instantly.
This is possible. We, as in the world, just ignore it for shinier stones.
Now, a small VPS in an AWS server lapses for 5 seconds, and half of internet is toast. Centralization for the PWN!