I agree! It feels like a good portion of the time when I see a new feature on a website it seems like it only exists because all the people needed to create it are employed at the company and we can't have them just sitting around all day.
Yes! Slack is dangerously close to the point of "every new feature makes it worse", while basic features that should work (scrolling to earlier in a channel that reloads history feels like a roulette wheel) stay broken.
This seems like a first principle. You find this in every organization which has served it's purpose. Lawmakers, developers, activist groups