I can't agree with this. That list of 9 complexities are well abstracted by the most common library or framework for SPAs. Having done a lot of SPA development

I can't agree with this. That list of 9 complexities are well abstracted by the most common library or framework for SPAs. Having done a lot of SPA development I can say routing is not anywhere up on the list of trouble spots you do encounter. State management is another story.