I have been using slack for about 7 years. Originally, it was an excellent way to communicate with one another and build a sense of seamless communication between the teams I worked with. Lately, I've found that the way people communicate have changed over the years and the product hasn't kept up to the changes. Discord being an example of one product that has built a strong community and communication.
Https://simply-b2b.com clients are added to slack channels to help us engage and assist on a daily basis. We also use this to manage our affiliate network
I love all the flexibility to extend the platform with custom emojis, bots, so rich. The recent app GUI refresh made it a bit easier to find what's relevant and what to ignore
Easy to use for simple tasks and startups. Once the tasks become more complex/ more groups etc it is not always clear to keep the oversight/overview once you are in different channels/ conversations.
Slack's user-friendly interface and organized workspace structure make it relatively easy for teams to adapt and start using it efficiently. The desktop app for Windows, along with desktop notifications, keeps users up to date.