I wish someone or something would define exactly what tweaks are.
Is there an objective list of particular devices or group of devices? Therefore, room treatments, cables, AC, footers/isolation, internal parts such as capacitors, resistors, etc. ?
Assuming there is such a list, who decides which groups or particular devices belong on that list?
Perhaps someone hears an effect from any particular device or group of devices. Is there some objective criteria that proves this person couldn't have heard what they stated they heard?
Is there some objective criteria pertaining to any particular person's estimation of value of any particular device or group of devices?
I agree a certain amount of skepticism should be practiced with particular tweaks. My criteria for possible purchase or believability for a group of devices or particular device is it has to observed to be effective to a relatively large number of people for a number of years. I can't be exactly precise on numbers or years. We've all seen some tweaks come and go, I assume the ones that are spoken of year after year are effective to at least to some degree, to some people.
And so, I see these threads as providing a service, at least to me. Someone is either providing introduction to new device or commenting on a particularly well known device. The new device will fail or succeed in marketplace and feedback on well known device is appreciated.
Based on one's criteria for what is a tweak, I either use a lot or very little.
Again, I'd like to know exactly what is a tweak?