For the individual - being good at several thingsFor society- mastering one thing to perfection
What about both? Mastering on one or two things and being good on many subjects.
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being good at several things
Several things, we don't need more "Fachidioten" ..
Being a jack/jill of all trades is better, just in case one thing does not work out for you, never lay all your eggs in one basket.
Being good at several because any profession today can become obsolete due to technology at any moment.
Depends on how you define mastery and what it really is. Time varies too much.