I didn’t realize that any of the Schitt DACs sound tizzy or shrill. But I have never heard one.
maybe tizzy and shrill are too negatively connotated words to describe what i hear in the schiit r2r dacs sound (gumby and yggy)... lets say they have ample treble energy (as do schiit’s amps), more than most r2r dacs, certainly r2r dacs with tube output stages like mhdt and audio mirror - schiit gear, certainly their more expensive stuff, have a certain house sound, which to my ears, is on the bright side of neutral
obviously many people do enjoy the sonic character of their gear