That is a bold assumption. No I could not tell from the description what is the issue and your solution above does not make sense to me.
From your second post it appears that the post-description template is meant for list pages, so basically you have turned all of your blog posts into Hugo sections, for these pages to inherit that list template.
If the outcome is what you need, all the power to you, however in the documentation there is info about the Layout Lookup Rules and the Template Lookup Order.
Anyway, please do have a look at the forum Requesting Help guidelines.
Thank you.