We have seen websites that overridden our unsubscription page and included their own integration with RSForms for example
This is exactly the reason why we didn't implement survey in version 7
It can be easily added using some 3rd party forms extension
When we developed version 4 (and later continued with version 5), such features or 3rd party extensions didn't exist so we had to implement such feature. Now, that is really not needed any more