> If you think that you'll be able to win over Slack by building a client that fast and slim, then you're wrong. Even if you can get to the market, because of the time you spent on polishing the experience the competition will be far ahead of you.

Seen this a bit, why not create literally an alternate client for Slack if customers actually care? I'm not sure this is a good argument. A large part of Slack is the backend and admin tools and advertising, without these to care about you can catch up fast.

There's the obvious risk being at the mercy of Slack, but any software has risk, getting big corp to pay for your 'better' client is high reward if there actually is value to clients, big corp will pay for it.