Care to share what the identifiable artifacts are
Reminds me of a lab experience from decades ago. We were doing bench listening tests to an audio circuit. We were using an HP bench power supply. We later swapped the HP for a Lambda supply -- identical E and I-limit -- and the tonal character of the DUT was shifted. That opened my eyes to the impact a power supply can have on audio circuits, and has been integral to product testing ever since. Do I understand the objective reasons for these supply-related tonal shifts? Maybe a little (impedance issues - reactance, loop gains, variation in load-switching behavior, filtering artifacts, etc.). But mostly it remains a trial and error process of finding the most accurate systemic sound.
Care to share which DCDC converters were deemed usable?
For full frame 85-264VAC-input SM power supplies with agency and regulatory markings, valid MTBF, deep protection, etc.., there are very few choices beyond the Far East. We've made a couple on our own, but offshore vendors like Meanwell have dozens of top power engineers on staff and do it better than we can.
For spot regulation, SM and LDO, we've used countless types from just about every vendor: AD/LT, TI, ST, etc.. Again, there can be sonic differences traced back to single reg choices (analog paths). We tend to vet a reg choice early in the design process (in situ) so there are no surprises later on. And you can't automatically say one part is always ideal. In one circuit app it could shine -- in another not so much. That's part of the art of analog design.