My problem is that every JS-framework story on HN is full of comments either a) showing a lack of understanding of the tech like the parent, or b) bringing up "fundamental issues" with SPAs which are either nonexistent or long-solved.

That isn't to say some concerns might not have merit, but SEO/SSR/shared routing/state/templates are problems with production-ready OOTB solutions.

If someone isn't familiar with the basic SoTA then they should refrain from commenting so harshly on it.