Why do designers/manufacturers...?

Its all about money and inventory. It cost a lot of money to stock expensive "tweaky" stuff. This also leads to higher selling cost. A high volume manufacturer has to remain consistent. There are a lot of consumers, in fact most of them, that dont want to have to pay the increased high price of marked up tweaks.

On the other hand, the manufacturer is the one who knows best what tweaks will provide an improvement with thier product and which ones will ruin the design as they intended.

Bottom line...would you pay the higher cost of a product that has tweaks employed that you dont believe in? Or wait till the warranty runs out and go with what you believe in.

And lastly, who determines what is a tweak vs what is simply smart circuit design. Sometimes the cost of parts for a smart circuit design do cost more. No [one] designer/manufacturer has all the answers.

I think we all know that no matter how good us manufactures design any part of a product, there will always be someone out there that believes it can be improved upon. Too many times a 'tweak' is not better, just different.

".....They would be better off designing better components that eliminate the need for tweaks such as better power supplies, rectification, regulation etc. But that would cost too much......"