I don't think it's THAT bad. I never in my life used IRC until I had to for the openstack-operators meetings. IRCCloud was easy enough. Then the mandatory nick registration thing happened and indeed I struggled there, but I got over it - people were helpful, there are many options and many people with experience of IRC in the openstack community willing to help.
Maybe Matrix would be better, but I don't think a complete jump from IRC to Matrix could have been done in time (see Clark Boylan's message about this further up this thread). On May 14th when I sent one of the early reports of this issue to this list it was far off and confusing-seeming. By today the move was arguably already very late. 12 days in and there's worry that the openstack channels will be taken over by shadowy forces.
As Joel Spolsky once quipped "delivery is a feature, your product should have it"
Chris