[sapeien]

1) Doesn't always work if you want to target embedded systems or need performance, and all you know are scripting languages with huge overhead like Ruby, JS, Python, etc. Some languages really are better than others.

2) Could say avoid distributed computing if your problem is not distributed. This is more about being a blind follower of the latest hype.

3 & 4) Complicated DevOps are a bad idea in general. Stuff that seems to simplify things on the surface like Docker are actually hiding tons of complexity underneath.

5) To most people, Agile = JIRA = Sprints = Scrum. It's corporate mentality codified, so it's no surprise that a lot of startups avoid it.