Replying to minikites here: your link says: "For many kinds of equipment (with automotive engines being the prime example), the time it takes to complete break

Replying to minikites here: your link says: "For many kinds of equipment (with automotive engines being the prime example), the time it takes to complete break-in procedures has decreased significantly from a number of days to a few hours, for several reasons." So the break-in period has gotten smaller, but certainly isn't gone. Also many/most modern car/motorcycle manufacturers still have break-in periods specified lasting hundreds or thousands of miles.