“It needed to load nearly 20 MB of Javascript, just to render the main screen!”
The South Pole gets about 750 milliseconds of round-trip latency, ten times a US coast-to-coast trip. One desktop app hardcodes a 15-second timeout on a config download and retries it forever without telling the user. Commercial ships at sea live on a few hundred kbps. Developers test on fiber and call everyone else an edge case.