It's more general to spawn a portal per component because then you can show multiple popovers at a time, like popovers that are always visible or only go away if you click "Close". So it makes sense to start there for the naive solution.
Yeah I suspect it was probably for this reason, but to answer the parent comment, yes it was required in the sense that it's simply how the Ant Design popover component works (or at least that's how it worked in 2021 which is when I did this).
