It also breaks a bunch of optimizations that browsers have implemented over the years. Compare how back/forward history buttons work on reddit vs server side rendered pages.
It is possible to get those features back, in fairness... but it often requires more work than if you'd just let the browser handle things properly in the first place.
Seems like 95% of businesses are not willing to pay the web dev who created the problem in the first place to also fix the problem, and instead want more features released last week.
The number of websites needlessly forced into being SPAs without working navigation like back and forth buttons is appalling.
