I would be wary of a manufacturer thinking that their product may be too warm. Just my opinion, but there should really be little difference between SS and tubes properly implemented.
Typically, DACs and tubes mate very well together, since digital is known to be less-than-warm sounding. If you disclose what your DAC budget is, then you will undoubtedly receive some great suggestions.
Synergy will make or break a system IMO. The sum should be greater than the individual parts. Perhaps that manufacturer's comments are out of context, but that sounds like a very stupid thing to say. They should have said overly warm and lush sounding gear may not synergies very well with their DAC. But then again, would overly sounding anything be a good component anyway?
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