It's better to have no cofounder than to have a bad cofounder, but it's still bad to be a solo founder.

Why couldn't it have been done 2 years ago, and why will 2 years in the future be too late?

If you pivot, do it fully and with conviction. The worst thing is to try to do a bit of the old and the new-it's hard to kill your babies.

If someone is getting every decision wrong, that's when you need to act, and at that point it'll be painfully aware to everyone.

If someone is difficult to talk to, if someone cannot communicate clearly, it's a real problem in terms of their likelihood to work out.

For most software startups, this translates to keep growing. For hardware startups, it translates to don't let your ship date slip.

Because it's one of these sort of connections between nodes- every pair of people adds communication overhead.