Nobody ever talks about the monolithic all-in-one framework upgrade? You really haven't come to terms with SPA until you've done the all-in-one framework upgrade, man. It's like running thru a hailstorm of razor blades
Just my anecdotal experience.
They usually follow the pattern of 3 seconds of hype followed by 10 years of digging out a mountain of technical debt from some asshole who has since moved on.