Earlier quoted context omitted.
I've had the opposite experience. I have never had any issue finding information in slack with history going back nearly a decade. The only issue I have with Slack is a people problem where most communication is siloed in private channels and DMs. Email threads are incredibly hard to follow though. The UX is rough and it shows.
I hard disagree. Don't have a conversation? Ask someone who does to forward it. Email lets the user control how to organize conversations. Want to stuff a conversation in a folder? Sure. Use tags religiously? Go for it. Have one big pile and rely on full-text search and metadata queries? You bet. Only the last of these is possible with the vast majority of IM platforms because the medium just doesn't allow for any ot…
It doesn't help that Outlook's search capabilities have gotten effectively useless - I can type in search terms that I'm literally looking at in my inbox and have it return no results, or have it return dozens of hits without the search terms involved at all. I don't have that problem with Slack or Teams.
However, I think you are right overall on email being better overall for what people end up using chat apps for.