<< The 3D projection, whether perspective or parallel will persist in Split view.
You only need jump to 3D view, toggle projections & jump back to Split view to change between them.

Yes it's this double "jump" who is pertubating when you have works for a long time in the Split view and want to stay in!

But I am agree it's just confort! :)
Maybe Michael needs the "3D" up corner for other things! ;)