Thanks for sharing. I have been doing the same, but you quickly run out of screen space - you have 5 pages open and have room for maybe 3-5 more before they become unusable with the header and undesired content of each pane taking up a lot of space. Whereas in Roam you just add whatever you want (be it a bullet, link, a few paragraphs, a video, etc…) to the sidebar and it is infinitely scrollable.
Come to think of it, your Scratchpad idea that you shared in my other request is a far better solution to this Roam sidebar feature than opening many panes in the sidebar. Just have one Scratchpad note in the side bar, always in edit mode, and copy whatever you like into it.