I didn't use try Traefik's documentation, but the complains appear to be somewhat structural. Meaning a PR would need to possibly restructure at least part of the documentation, or add a whole section of documentation of a different type.
You can't expect someone not core to a project to just propose to restructure the whole documentation. Which may also mean changing the website.
And in any case, such overhaul coming from a "nobody" would very likely be rejected as being both too large or incomplete or not desirable.
Re-structuring needs to be pushed for by at least one person from the core team.
So yeah "Just submit a PR" in that context is not an answer, it's an excuse to avoid trying to understand the problem and actually improve the situation.
You can't expect someone not core to a project to just propose to restructure the whole documentation. Which may also mean changing the website.
And in any case, such overhaul coming from a "nobody" would very likely be rejected as being both too large or incomplete or not desirable.
Re-structuring needs to be pushed for by at least one person from the core team.
So yeah "Just submit a PR" in that context is not an answer, it's an excuse to avoid trying to understand the problem and actually improve the situation.