I would still have some issues. I do find IRC archives much, much less valuable than more structured sources.
But I'm picking my battles at this point in time. And the lack of indexing is the most critical flaw and one I think is immensely damaging to technical communities on those platforms.
It's the fact that slack and discord are essentially walled gardens that do not allow for third-party indexing. Therein lies the problem.
If public discord servers were indexable you'd have no issue with it.