Cartridge ISOLATION; What Say You?

another good read, it does go against my 'instinct' of a rock solid cartridge/arm connection. (non-removable headshell) 

Who thinks what?
Who tried what?

https://www.tnt-audio.com/accessories/isolator_e.html

btw, has anyone tried a Len Gregory cartridge (with or without the isolator)?

another comment in the article: reviewer mentioned a layer of isolation under the tonearm base (he tried blu-tac). Also against my 'instinct'.