One of the first things to ask is: Are you sure you won’t suffer a devastating power surge?
For me in a thunderstorm and mediocre power delivery state (South Carolina) the answer is no, I’m 100% sure I’ll suffer at least 6 to 12 power disruptions a year and some of those will be lightning induced surges. The one laptop I lost since moving here was because it was plugged in during a storm and I forgot it wasn’t on a surge protector.
I also know that even if I had insurance I do NOT want to pack my amp into a box and then into the car for repair.
The other part of this is rather theoretical. Having a dedicated line in no way eliminates noise. It may reduce noise from other devices but whatever is coming down the power line is still there and even motors on other circuits can and do show up on the entire panel. I’d rather have noise filtering at the surge protector than not.
I wrote about my thinking in detail here, I hope it helps:
( My original post had an outdated copy of this article, my bad)