I agree, unfortunately WordPress ignores any and all info input on the page set as the blog. The same reason why the title and content don’t show up either.
The sidebar for the blog can be set in “Customize > Layout”. Footer widgets will be able to be turned on/off with a PHP function for specific pages in the next version, and the rest can be pretty easily hidden by CSS.
Maybe WordPress changes this one day, but there must be a reason they do it.