Interesting points Bob, especially coming from someone who was in the industry previously. I never thought about the cost a shop would have to put up to offer valve servicing on shim/bucket engines but it makes sense. Then again, this advancing tech is what makes a high revving small-displacement machine possible on levels we could have only dreamed of decades ago. It is the way of the world. What the Japanese did with 600ccs in the early '90's was revolutionary. Then again, what they did with 500cc two-strokes was as well and it was simpler
My Suzuki is shim and bucket. After 40k+ miles they're all still in spec. I can't argue with that.