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Comment There is a downside (Score 1) 45

The downside is: having a thumb that is good for texting goes completely against the grain of what you want for the use of fine dexterity for other applications.
In most activities that require good dexterity, the thumb provides a steady rest, with only small but strong movements, using control.

Don't believe me?

Grab and apple and peel it.
Grab a pencil and write.
Hold a ratchet, a scalpel, a tweezers, scissors, a soldering iron....

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