I haven't found artifacting to be "micro details". In general, artifacts are big ugly splats. It's just that in electronic music, a big ugly digital splat can get hidden behind a bit of guitar distortion or synthesizer bleat. If you are used to listening to acoustic music, you don't need a heck of a lot of training to hear digital artifacting. It sticks out like a sore thumb.
But the nice thing about artifacting is that it is all or nothing. Something artifacts or it renders properly. There's no shades of gray inbetween. Once you find the bitrate that can sucessfully encode music, anything beyond that line is fine.
When people refer to microdetails, I think they are usually referring to the effect of masking. As you balance your frequency response, details that were covered up before start to come forward. It hard to know exactly what people are referring to with vague audiophile terms like "micro details" but that seems like a more likely explanation than artifacting.
I've been wondering lately if there's any attribute of an amp that would make it more "resolving" than another amp. I've especially been looking at differences between op-amps. "More resolving" and "micro-details" are terms used often. Do these terms have any merit?