Too bright being high resolution is a generalization ...I agree completely. There's no inherent link between brightness and resolution. In fact, some of the highest-res recordings I have - the ones that are filled with detail and nuance - aren't bright at all. They may be extended on top, but never bright. Brightness is actually often the result of distortion, not detail.
One can have a harsh/bright sounding system that can't reproduce fine detail
Is it too bright or is it high resolution?
It has been said in the forums that one mans bright sounding amp is another mans high resolution amp. Some amps and preamp combinations can deliver a high resolution presentation and to others this may be considered too bright sounding. Is there a fine line that can distinguish between the two? Personally I like very revealing & the fine details delivered but the wife says it sounds a tad bit too bright.