Not everything needs to be a native application, nor should it be. The vast majority of SaaS and such apps are SPA/equivalent and would NOT benefit from being yet-another-installable app.
Could you provide examples (not exceptions) maybe to support your PoV?
So the smaller-scale correlate would be that SPAs can make more sense for proof-of-concept or hobby-developed applications that need some cross-platform access.
SSR means most processing happens on big iron inside a dc, this has to be more efficient than each user buying a new machine every few years just to have that peak js-perf needed for the latest frameworks.