There was this thread talking about 2.80 tool settings UI development at the early stage. Although many of them were properly visualized, this was what made Blender tool settings overduplicated.
https://developer.blender.org/T55386
Moreover, the tool settings was also added to the N-sidebar, although it wasn’t planned earlier in the link above.
During the development, the topbar was removed due to its global characteristic, but why not the tool settings tab in the properties editor?
And why do we have to have 2 tool settings(header + N-sidebar) in a single editor? It really makes no sense.
It seems like the development lost its way in some way, especially in the last few months.