I am talking from experience, where I 'job hopped' to get better jobs which treat me better, fit me better, pay me more, have smarter colleagues and better systems (aka. more agile not just talking about it), and benefits, healthcare. I did my research (mainly getting the confidence from articles online), whilst hearing too often the idea people have in their heads: I should stay a longer before considering moving because it looks bad on the resume. What you hear from everyone/ common wisdom can be a justification for themselves not taking a risky and uncomfortable move.