Issue with position: relative on container in alpha 6

[ilyavolodin]

Alpha 6 introduced a minor change to container class with this PR: d9fcdcf
Even though it's a one-line change, it has a huge effect on layout, since if you are using Bootstrap grid for page layouts, it's now impossible to create absolutely positioned to screen elements from inside the grid. Having position: relative on container is very limiting. Unfortunately PR that was merged doesn't really explain why this change has been made other then in the title.
There's a comment on the PR #21464 (comment) that basically says the same thing as this issue (but it's not clear if it's supporting the change or warning against it).

Is this something that can be reverted in the future releases?