Probably not, but why do they need the billions of dollars of funding and steep subscription cost then?
The per-user cost is only Silicon Valley reasonable - it's nearly as high as GSuite which provides a lot more value, and if so many other major business suite companies (Google, MSFT) weren't absolutely terrible at building chat applications I'm pretty sure Slack would be forced out of the market (or to actually compete).
People and companies have a really hard time with something being "done".
One could start reducing the engineering and sales force, focus on polish and maintenance, gradually reduce price and collect on a successful useful product. That kind of declaring victory doesn't happen though so products get engineered into uselessness and get bought out by companies who collect on them by neglecting them until only people who happened to get stuck are still using them and everybody moved on to the next hot thing.
It's hard to justify CEO and management salaries when you decide your product is finished so instead they just keep doing things and end up ruining something great.
I’d like to see a slack version ticket tracking for example — not a slack feature, just a separate product.