Most developers I have worked with are cowards exactly as he used that word. Now in all fairness my career is largely limited to large corporate employers that only hire Java developers and, god forbid, JavaScript developers. It’s frameworks, Maven, and NPM for absolutely everything.
The hiring managers always claim to look for innovators, but then you get in and everyone is just the same. Thousands of developers just retaining their employment doing the same shit day after day, fearing any changes coming down the pike.