When one builds designs that are the creations of others, what they are building is another's take on what a frequency range and distortion is to be like for a particular audio device.
I have EE friends who have built and measured audio devices and friends adept at building audio devices that have built items that have been measured. Where the results of the measurements taken, strongly suggest the critical areas of sound production that relates to audio fidelity are not produced as a result of the design, not an issue with the actual build of the device.
The same is also known for Off the Shelf Branded Audio Products. Reports in the media have been made showing certain measurements but not all. Suggesting if all measurements that could be taken had been taken and shown, for those who read data with a good understanding, a product would have been identified for their not aligning to what is considered as having audio fidelity.
I like to think my choices I make with audio devices are tightly aligned to what is considered meeting the fidelity of an audio design, being how accurately sound equipment reproduces the original source, whether it's a master recording or live sound in a studio or concert hall. High fidelity (Hi-Fi) implies a high degree of accuracy in sound reproduction, with minimal distortion and a focus on clarity, precision, and realism
I am not keen to have a design that produces a sound that come from a bespoke circuit design which is not entirely conforming to attaining audio fidelity.