If, knowing what you know now, you could go back in time and be the one to create Slack would you not do it? Even if everyone is using Teams now (they're not), it took a really long time to show up that Slack's founders were able to capitalize on.

The change in the software landscape today is the apparent ability to develop a competitor faster thanks to LLMs. But, as the parent points out, the bottleneck was never code writing. It was waiting on the people involved to get past their egos. LLMs have done nothing to change that.