I’ve since replaced those components that used them with others that have a "real" power supply that takes an IC connector to avoid separate power supply issues.
Unfortunately - playing with a power supply can get you into hot water if you do not know what you are doing. If you are an electronics hobbyist or in the electrical field then you will appreciate what I am saying and therefore can make the appropriate changes in a safe manner - otherwise I would not recommend changing them.
There are companies out there that make better power supplies, so I would seek them out on the web and replace them
The do make a significant improvement
If the supplies provide a DC voltage then their impact on other cables will be minimal, but if they are AC you can have an emi/rfi issue with cables that are in close proximity and running in parallel.
Personally - I keep all my cables separate and avoid the issue completely
Hope that helps - Steve