I look at footers as tuning devices. As such, the appropriate type of footer--whether it is designed to tightly couple the speaker to the floor or whether it is designed to decouple the speaker from the floor and dissipate energy in the device--depends on the specific system and room characteristics. For example, coupling to a poured concrete floor is entirely different in effect to coupling to a suspended wooden floor (where coupling could make the floor act as a sounding board).
Because there is no one singular "right" approach in all circumstances, it would not make sense for the designer to build in multi-thousand dollar footers or speaker platforms when that might be the "wrong" approach in a particular application.
I use Symposium platforms under my speakers. I have heard experiments with the same platforms under other speakers in someone else's system where that was NOT the way to go. With all such tuning devices, experimentation is the way to go. I cannot think of any such devices which universally improve sound--components, environment, personal taste all matter; if it alters the sound, it can alter it for good or bad.
Because there is no one singular "right" approach in all circumstances, it would not make sense for the designer to build in multi-thousand dollar footers or speaker platforms when that might be the "wrong" approach in a particular application.
I use Symposium platforms under my speakers. I have heard experiments with the same platforms under other speakers in someone else's system where that was NOT the way to go. With all such tuning devices, experimentation is the way to go. I cannot think of any such devices which universally improve sound--components, environment, personal taste all matter; if it alters the sound, it can alter it for good or bad.