All of this, with the addition that you should have the option of panning in both dimensions from a single toolbar widget if the document supports it. I've seen that implemented but never with the arrow buttons together rather than at opposite ends.
> - Wide, clearly visible and easy to hit.
Way back in the day, there used to be a field of study called Human Computer Interaction, where people would learn about things like Fitt's Law, and the fact that the edges of the screen were particularly valuable because they effectively had infinite size.
I am on OS X. For my sins, I have MS Teams open. It is hard aligned to the right of the screen. On the right edge of the window is a scroll bar. I shove my mouse to the right, I click to grab the scrollbar (which has conveniently expanded on mouse-over, and now extends to the edge pixels), and... the entire window gets dragged.
I don't know how we have ended up here. There was a period when people were actively researching what made good user interfaces, and it was feeding in to end user experiences, and it showed.