There are way more positive opinions about isolation than negative or kneejerk overreactions.
It seemed to me, the BHK300’s having the tube input stage are more susceptible to unwanted vibration, so I thought I would realize better performance isolating them first. It’s a significant expense installing seven sets of isolators at one time. It seems the power plant wins in the mass category though; the weight delta of components P20 is 96lbs, and BHK300 is 83lbs. I plan to isolate my P20 further down the road.