Concept... [in the distant, distant future...] - Dynamic size of titlebar, like on BeOS, Haiku

[ardnod]

"BeOS mode".

And this solution instead of tabs eg. on file manager (option)
(photo edit):

I don't know if this is possible in other desktop environments.
On screen: XFCE

[DGMurdockIII]

Yes please

[ardnod]

"I overdid it" ...