The tabs on the request page always seem to open by default. For a normal page the system 'remembers' the view-settings last used.
When a user collapses a tab on a card page, then the tab is collapsed the next time the user opens the page. This does not work (yet) on a request page.
The business value is that the user can hide information that it does not need to see. Also it will have the pages in the system behave in a more similar way.

For more info: https://www.yammer.com/dynamicsnavdev/#/Threads/show?threadId=1102597230190592