Earlier quoted context omitted.
Its also really not that hard to make cmd click + back button to work properly with client side nav.
Can you support iOS's "peek" menu as well?
If on the other hand, if you encounter code like the abomination below (which breaks cmd+click, peek and forward/back), you should not (imo) conflate it with actual client-side navigation. I suspect that's what some comments here are referring to.
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1. https://developer.mozilla.org/en-US/docs/Web/API/History_API