In reply to Pete.

Amanda,

You are right in one sense, most themes don't support a proper seperation and most user don't care

However:

1. If is perfectly achievable even with the current editor and themes (shortcodes muddy the waters a little).

2. Most users don't know the harm/problems created by ignoring this separation.

As such I believe Wordpress should not make things worse by going page builder with Gutenberg.

Especially as presentation is becoming commodified and the days of brochure sites is ending. The future is wordpress as a cms and page builders are antithetical to running a cms.

You are completely wrong about standards.
They do generally win in the end, especially online. See HTML, browser standards, mobile tech etc.