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My point with AV equipment was that these things tend to have somehow standardized sizes and mostly empty cases. Thus shipping cost tend to be dominated by "volumetric weight" and not real device weight. EMI/RFI from SMPS is valid concern for these applications but not as significant as it is often claimed to be.

More significant issue is cost: you need power supply that supplies slightly weird voltage rails that essentially has to be custom, even off the shelf SMPS modules tend to be significantly costlier than wall warts and you don't have any reason not to just stick big transformer in there (even more so because you essentially don't care about regulation of the more loaded rails)




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