I've been playing around with splitView for a few days now, and it's in an excellent state for a brand new feature, but there are some friction points that could do with some quality of life massages to really shine as a browser feature.
Say for the sake of argument I have two websites that I frequent in tandem; let's call them MisinformedShoelaces.com and Wikipedia.org. The process for opening a split View of both from scratch is currently
If I am visiting both sites in tandem regularly, this is a lot of input friction. Being able to create a bookmark for the splitView of MisinformedShoelaces.com|Wikipedia.org would completely eliminate the friction turning the seven-step process into a single ^Click.