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The latency issue is increasingly disappearing or at least becoming negligible in most population centersI believe that thats your experience. Its not really because the technology is improving though, its because you're growing older.
The latency is absolutely horrendous, and anyone thats used to a decently performing system will not agree with your opinion.
As a simple example: i can easily code 6+h with no break on a good system, with these mainframe system i'm gonna take a break at least every hour because the fatigue builds up so quickly.
Its every little interaction, simple input that doesn't appear for 50+ms, switching owrkspaces thats delayed for 150+ms.