I am not sure exactly wtf a "highly immersive" experience is, what I do know is I'm shipping marketing pages that take like two minutes to load on "slow" connec

I am not sure exactly wtf a "highly immersive" experience is, what I do know is I'm shipping marketing pages that take like two minutes to load on "slow" connections and "old" phones (a.k.a. "our real users") and don't have top-of-page content or layout figured out (a.k.a. do their job) without a shitton of JS, CSS, a front-end "framework" and we can't ship new functionality (a.k.a. do our jobs) without a huge conversation about components, assets, and how the build process should work, disagreements on pet patterns. I wish I could rebuild the home page in server-rendered HTML, a minimal hand-written set of JS and CSS for top-of page plus a fairly lean set for everything else, cut down to two fonts (headings and body text), preload the blocking assets, defer non-blocking assets, put pages and everything into object storage + CDN, and just... I dunno... serve our users. Any build tools or automation or content editor tools should lie on top of any of the above (Most of the "immersion" or whatever should remain intact, aside from what I see as bonuses: minor improvements to consistency in type and presentation).