One example I like because it's so telling: driving. Over the course of their live, people drive a really long time. But after 10k hours, are they racing pilots? (Some drivers can't even park properly...)
Literally the point of Ericsson. The "D" in "DP" is not just there for decoration.
Examples like driving or touch typing are among the most-mentioned examples in the literature for skills where people just go to "good enough" and then plateau, because they don't deliberately aim for improvement.
This misses the point because people are not doing 'deliberate practice' while driving. If they spent their time actively trying to get better each time they drove things might be very different.
The point is that one needs specifically deliberate practice to achieve constant improvement. GP is saying that driving demonstrates this by showing that non-deliberate practice ceases to show improvement fairly quickly.
