Steps to reproduce the issue

From ages Joomla! don't offer an out-off-box solution for applying an article alternative layout on a category without a article link menu or directly in the article params. We have to test the cat ID in article/default.php override.
I think the right way of thinking was to apply a article alternative layout from a category item menu for example.

Create an alternative article view
Create a Blog view
We can't select an article alternative view only alternative category

Expected result

Having the possibility to select an alternative article view

Actual result

Nothing to select

System information (as much as possible)

J3.6.5

Additional comments

After reading the article/view.html.php we see the controller just check for the article_layout params in ANY type of menu item including category item menu !
We just have to add the <field name="article_layout" type="componentlayout" extension="com_content" view="article"... fields in the menu item XML (blog.xml if we use the default menu item) et voilà ! We can select an article alternative layout
Our main question is why is it's so simple why Joomla! don,'t use it actually ? What we are missing ?