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"Web browsing, of course, isn't really affected by latency."

Web browsing involves a lot of ping-pong traffic pattern that multiplies latency.

When you say video, do you mean video conferencing? I don't see how latency would affect video streaming significantly, other than the initial buffering time. In fact I would say high latency affects general web browsing much more than video streaming.

Web browsing can be super slow if you have a high latency. Between the DNS requests, the TCP handshakes, the TLS handshakes, it takes forever before you start receiving the actual content.

Where are you getting the 800 ms latency though? That's what Geo stationary satellite internet provides due to the physical distance they have to operate at (35786KM), but Starlink and OneWeb and other mega constellations are operating at 550KM which easily gets you below 100ms and likely close to 30 ms without sat to sat comms.