The "fast enough" illusion comes from having consumers adjust for years to flaky wireless connections after we had a good period of steady broadband performance improvements. If the latter had continued at the same rate, we could now rely on home users having at least 10-100 Gbit/s bandwidth and could build entirely different kidns of applications.

IOW: Apps could definitely use high bandwidth & low latency networking (think AI acceleration, remote storage, volumetric telepresence etc) if we had it reliably, but our due to wireless transition apps are adopted to stagnating speeds.