+1. You can do something about noisy power. It is also relatively cheap and simple to improve compared to others.
How quiet your listening room is really important. If you can drop your listening room to the 20 - 30db range you give your system an enormous advantage.
Of course, you can do something about noise pollution… Moving to the country can greatly reduce this. Or spend a lot of money insulting you room and or house. But that will not reduce physical vibration which improves sound quality from components… from cars and trucks rolling by, airplanes and other urban stuff.
Then there is room geometry and acoustics. Huge impact.
There are so many variables to control. Powers just one.