Although some layouts are used far less now, I hesitate to say "obsolete".
Most bowlers can do much more with surface adjustments, especially with the many products we have access to such as abralon, white and gold scotch brites, that can "shine" the ball without polish.
The one thing that a great ball driller needs though, is an imagination and the mindset to not put everyone in the same drilling or layout. Who knows what the future breakthroughs will bring?
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Lane Carter, Strike Zone Pro Shops - Salt Lake City, Utah