Customer Development is Not a Focus Group
steveblank.com
steveblank.com
http://www.slideshare.net/dmc500hats/startup-metrics-for-pir...
He takes an even more brutal approach to customer development: you should remove features until your customers scream at you!
This might be a bit too severe but I think that it summarises the core philosophy behind customer development pretty well.
I doubt that MIPS Computers was in a position to dictate standardization to their market, so building a flexible but less simple product may have been the right call at the time.