This argument is tired and ignorant. Try building linear.app without a SPA framework. The idea that "Native CSS transitions have quietly killed the strongest argument for client-side routing," is dubious at best.
Linear's speed comes from being "offline-first", but I challenge you to name almost any other product in common usage that does it that way. It's just not common. On the other hand if I want to buy tickets I'd rather most of that website be SSR and do SPA where you actually still need it. Or forums, news sites, blogs, and informational sites.
There is so much out there that would be better developed with SSR and then use CSS to make it feel SPA-like than to actually be a SPA.
A long time ago some webdevs started abusing the SPA concept to build simple websites. However that is not within the original meaning of the term SPA, because simple websites are not web apps. The author assumed that everyone would just understand that they are talking about SP"A"s and not SPAs, because for a certain subset of webdevs working on websites, the antonym of SPA is MPA, and it's normal to refer to your website as an "app". However for a certain other subset of webdevs, the antonym of SPA is simple website, and what the author is talking about are not SPAs at all.
Because I mostly built backoffices, chats, forums, ecommerces, all things that would've worked better as websites.
I'm not going to doxx myself by naming all the companies, but here is an example of a page that has too many features to work as a website. https://www.compass.com/listing/7310-estrella-de-mar-road-un...