YAML is a generic format which leaves formatting as a result of effect to you. Ansible puts rules on top of it, which makes intendation not always trivial, it is easy to have an dangling key value pair which doesn't cause an error, but has only an effect with the right intendation.
I call this no-js-first. There are apps that are blazing fast and have a lot of fancy/modern js stuff in it, they simply don't require any of it at all.
> Also, JS is cached. First time will be slow, others, not so much
This is a very weak argument.
* many 3rd party resources are not cacheable or may have bad policies
* caches may be more often cold then you expect. most apps still cache large combined blobs, which will invalidate with each release.
* pure JS size has still it's impact on performance
* caching won't magically cut all network roundtrips which you need due to architectural reasons
Yes, but you can optimize your website for caching. Your points are valid but they mostly boil down to "people don't know/don't care what they're doing", which won't help even if you don't have JS in your site.
