I use Slack to help manage projects. It’s pretty useful. Apparently, others think so, too. After its listing on the New York Stock Exchange, the company was worth $23 billion. But something about Slack’s rise had me thinking about how much further it could go — and if it’s not careful, how far it has to fall. Here’s an introduction to my commentary about workplace collaboration in Forbes. About five minutes after their triumph, it would be funny at best,…