wsdn

The deterministic IPv6 approach is fascinating. Have you run into any issues with ISP-provided IPv6 prefix delegation changing over time, or are you strictly using ULAs (Unique Local Addresses) internally to bypass that headache?

This is exactly it.

Typing was always just the interface. The keyboard was never the scarce resource. Judgment was.

Architecture scales. Implementation accumulates.

If a 120MB app is required just to display an itinerary PDF, that's an architecture problem, not a UX problem.