We could have datasource-backed tables and list elements. Built-in. Sorting for most purposes, "for free", and more with simple and light JS hooks for sort functions. Frames that actually work as useful UI elements. "Basic auth" screens that look and function well enough for lots of purposes. Something like "Apple Pay" or other external payment systems but built into the browser, replacing stupid amounts of time spent writing yet another payment form (and usually fucking it up in several ways)

But no.