Valentino Rossi said the exact opposite in his book "What if I had never tried it". He said that Ducati relied too much on computer simulations and less on human input. That's why he liked Yamaha. They valued human input. I know many Ducati owners believe their bikes have soul, so the last thing they wanna hear is probably that the bikes are developed by computer simulations instead of human input, but that's what Rossi said. Then again, most bikes these days are probably designed mainly with the help of computers anyway.2 reasons.
1. The trellis style / bird cage frame has become synonymous with Italian bikes.
2. Its one of the old school ways of frame design!
The Japanese design their frames on computers & the physical test ride is one of the last steps prior to final approval and manufacture.
Ducati to this day designs their frames with a test rider from the get go! They start with trellis frame with a good known geometry / rake etc and start adding or deleting tubes after each ride depending on the riders comments! Obviously more involved but basically its all old school, real world trial & error testing every step of the way on a track.
Until very recently frame manufacturing cost and weight was not high on Ducs list of must haves.
Great report BTW.