You need to separate theory from practice....In theory yes, adding caps might add up to better measured performance. in a class d amp trace lengths, paths, and lead lengths can have a huge effect. Bruno has said that changes that can have a serious impact are measured in millimeters. How can you tell me that piggybacking caps on top of each other with the long leads, like in this mod, have not had any such effect on performance without measurements? Simply saying, "because it sounds better" is meaningless- there are amps with large amounts of distortion that some people find enjoyable, so that is no indication you have improved the objective performance.
And let's say that yes, these additional caps have been implemented in a benign way such that they actually do improve the objective performance in some way. How can you say that this improvement is large enough to be audible without measurement? How can you say this improvement is audible if the performance is already at the point where measured distortion is below the limits of human hearing? If you say, "there are things we can't measure", then I will say again, if you can't measure it then you can't know if it is an objective improvement or a mod you find subjectively pleasing.
