Wide blog post is difficult to read" on huge screen.
Hi Paul. I think it must be left at the discretion of the user, since the Joomla article is not always a blog post. From this you can make a product card or Landing Page for example. Such restrictions in the template will make use of extra code to get rid of it.
And in any case, it is an incorrect technical decree. Proper technical solution is the use of max-width and margin: 0 auto; to article-details class. The global template grid should not be affected by such things. Because such things do not give the template to be universal. Different CSS methodologies talk about it and it is correct.