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VW Is Putting Buttons Back in Cars Because People Complained Enough
(www.thedrive.com)
This is a most excellent place for technology news and articles.
We used to have a rule in computer system design that if an event would take more than 4 seconds we had to show a "waiting" icon like the hourglass.
Now though, people are sensitive to half a second between tap/click and something happening. Incidentally there's no reason for a fuel pump control to be slow, even running on a potato. The engineer who designed it wasn't given time to make it efficient