Re the Schiit manual:
1. Even if this is true (and probably is) it conveniently sidesteps the issue that a lot of SACD/DSD files are unique masterings of certain recordings, if you want to listen to those then DSD is the way to do it, inaudiable rising HF noise or not.
2. including the ability to process DSD files in a DAC doesn't make it any less optimised for the job of processing PCM files, look at all the best measuring DACs Amir has tested for proof of this.
3. If you want a DAC where DSD is processed as simply as possible, get one with an AKM chip, there is no conversion to PCM. ESS chips apparently do not convert DSD to PCM either, but there is some additional processing to enable volume control with DSD files (fwiw this works very well).
DAC suggestions: any of the D or E series here with balanced ouputs (there's a few):
https://www.tpdz.net/dac
or the SMSL stuff: D-6S, DO100, etc etc