Is it too bright or is it high resolution?

Is it too bright or is it high resolution?

Yes.

The answer is in the ear of the beholder.
There is a very fine line between high definition and too bright.
You will know it when you cross it. You will find that your listening sessions growing shorter as listening fatigue begins to set in sooner and sooner.

While I do enjoy high definition, I do realize that one can go too far.
I have heard systems that have reached the point of sterile, amusical, and uninvolving.

Decades ago TAS had an anecdote about an audiophile who goes to a live symphony concert and turns to his companion and asks, "where are all the high frequencies?"

Too bright being high resolution is a generalization. To get high resolution, you need a system where the source and amp can actually reproduce the fine detail, and then speakers that can deliver it as well.  Many budget and vintage speakers simply can not.

One can have a harsh/bright sounding system that can't reproduce fine detail.

Too bright being high resolution is a generalization ...
One can have a harsh/bright sounding system that can't reproduce fine detail

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.

Brightness can also be caused by tipped up upper mids which does give the impression of more detail. I hear this tendency in some systems, speakers, silver wire etc... The same detail is there, but it is tipped up a tad and a tad more noticeable to our ears. I call this brightness.