What’s wrong with the hash approach?
When working with external files a programmer almost has to work with the framework, and once (s)he does that the framework - well, a modern framework - would take care of the security details and do it right.
When working inline it's too easy to add a script tag manually, and from there it's a bit too easy for someone in the team to miss something (write a js without the hash/nonce and not notice the warning) or talk him/herself down to lowering security ("importing this 3rd party js is too hard, lets use just a nonce and forget about hashes", "this policy is too constraining, it's just a SMALL script, no risk here").
When working in a team, it's much better to have a hard and fast rule which forces everyone to work right. There's really no reason to use inline when using external files works really well now - and is apparently better for responsiveness too.