I think he's right, if you're at a small/medium sized place, all the reasons he lists there are solid reasons to buy and not build things for yourself. That being said, there's no reason to make that an absolute rule, I think it's ok to build some things and buy some things. Just think of all the things we've ended up with because someplace built some thing and it ended up being some big thing that we all know. Isn't that how Slack and Docker both got started?
