I was just giving some examples, it being theoretically possible in SPA isn't really helpful given that nobody will implement it that way. You're basically living in theory.

I've literally done the before and after on this a handful of times and it's always worse off. Management will never do that, it's always design by committee, the KPIs won't be defined or will never really have teeth, it will turn into someone's vanity project, they won't even pay someone to optimize the code - quite the opposite, they'll choose to build it on something like Salesforce or some other very non-performant enterprise-y platform, etc, etc. All the TUI get these performance gains out of the box without much additional effort. The constraints of the UI are it's strength as it prevents people from adding all this bloat in the first place. When you leave it up to people, especially business users or UX folks, it will get spoiled. It's almost a law.