Do isolation devices really help?

Isolation devices in conjunction with equi support (after all, the equip IS sitting on s/thing, isn't it?) produce the following general effects (VERY generally speaking):
*shift in tonal balance; i.e., it may shift the perceived reproduced spectrum, say, upwards...
*extend the spectrum; ideally both ends, all other *good* things remaining equal (i.e. more perceived bass, treble). Speakers are obviously correctly placed!
*change tonal balance, i.e. part of the spectrum is perceived as being more pronounced than before -- hopefully, correctly so.

In short, you're "tuning" or getting rid of the deleterious energy that seamingly compromises the performance of yr equip.
These are the product of coupling, decoupling, and generally protecting equip from vibrations of internal &/or external origin. Sometimes, rendering a piece of equip rigidly inert to movement also helps...

I.e. I'm just repeating the above in a different way! For specific products & practises & tricks, there's lots of literature in the archives.!

Pbb: of course the manufacturers benefit. Similarly with components, music, performers, milk producers, micro-software producers, self-professed gurus, demagogues, and many others :).

This is most unfortunate.
I.e. that person(s) known or unknown benefit, probably financially, from activities of a similar or dissimilar nature...

But the original question was, does s/thing that isolates help? Not how/whether manufacturers of same benefit -- or whether it's acceptable that such products are in the offering. Cheers!