I would love to see (as an extension to the feature allowing you to detach tabs from a window to create a new one) the ability to create a new window by dragging the new tab button off the tab bar.
When I want to make a new window I find that it is often more convenient and intuitive than other methods to first make a new tab, then drag the tab off the bar to create a new window. Recently I’ve been instinctually combining those steps into a single step, dragging the new tab button off the bar. This feels like it should work and would be intuitive and would smooth workflows and navigation if you could do so (especially for researchers and/or those with multiple monitors using Brave).