> In doing so they neglect/break basically everything else - SEO, connected martech, analytics, etc etc.

This is exactly how it looked like when Flash was a popular choice for making web interfaces. We've fought a long, hard battle to finally get back to indexable, interoperable, standards-based HTML, CSS, and JS. It was fine for a while, then Angular happened. Fast-forward a decade and we're right back when we started. Amazing.