I've seen this happen reasonably often in audio for speakers, preamps & power amps. A certain speaker manuf was wary of users trying anything other than the hard rubber (or was it plastic?) & very sturdy feet that were factory-fitted. The whole speaker system was designed as 1 holistic component which included the feet.
I also got a very similar response from a preamp manuf - he told me that his factory-fitted feet were the best & that he had taken care of vibration control in the chassis & overall product & that adding fancy-shmancy feet would do nothing to improve the sonics.
Same deal with an amp manuf who said that using metal feet would make the sound of his amps bright & that his factory-fitted feet (very sturdy) are the best.
Quite common for the manuf to say this but as I found out, they are not always right! Experiment & listen & you might find a better feet solution for your application.
I also got a very similar response from a preamp manuf - he told me that his factory-fitted feet were the best & that he had taken care of vibration control in the chassis & overall product & that adding fancy-shmancy feet would do nothing to improve the sonics.
Same deal with an amp manuf who said that using metal feet would make the sound of his amps bright & that his factory-fitted feet (very sturdy) are the best.
Quite common for the manuf to say this but as I found out, they are not always right! Experiment & listen & you might find a better feet solution for your application.