Single page applications are one of the most anoying web patterns i know of. Please just let me have one page for each ting to do so i actually can bookmark it properly.

This is possible and, in my experience building them, the norm. SPAs have routers and update navigation state, including history for browser Back/Forward

Ive made SPAs in Blazor that make it a point to update the URL whenever a "navigation" occurs. I also made it a point to ensure refreshing or loading the URL restored the state.

It's a small problem compared to the ease of use for development you can gain via Blazor, so I don't see any reason not to solve it.

Once backend and frontend became two separate teams frontend people didn't want to keep asking backend to make logic changes for state, so frontend took things into their own hands. The mistake was making it two separate teams.