What is the issue with the HTML Standard?

According to descendant script fetch options, module script dependencies are fetched with an "auto" priority.
I'd love to understand the reasoning for this - given that the descendants are blocking the parent from executing, if the parent got its priority upgraded, shouldn't the same apply to these blocking dependencies?
In the inverse case, if the parent got its priority lowered, the dependencies are similarly of lower priority.

Is there a reason the descendants don't simply inherit the fetch priority from the parent?

^^ @domfarolino