I personally don’t see any value in having additional shortcuts for these. I have more than 9 views in my main timeline but do not visit them all enough to merit memorising what the shortcut to each would be. And I doubt I could memorise more than a few anyway. The fact that there is a show next/previous tab command is good enough for me if I want to switch between tabs with my keyboard. Though in a timeline app such as this I am mainly using my mouse anyway to navigate and explore the content of the different views.