All speakers lose their ability to be accurate once placed in a listening room. Early reflections, modal nodes, etc., all play a part in reducing the realism to a certain degree even if the speaker is 100 percent true to source.
Also, IMO, a more accurate speaker has the potential for being less musical since the accuracy highlights any flaws in the system, and in some instances make them unbearable - especially with digital sources. This is one reason some people tend to think not so highly of Thiels.
So if you're making a buying decision, the equipment connected upstream will be more of a factor in accuracy - at least the accuracy you are looking for - than the speakers' resolving ability.
Also, IMO, a more accurate speaker has the potential for being less musical since the accuracy highlights any flaws in the system, and in some instances make them unbearable - especially with digital sources. This is one reason some people tend to think not so highly of Thiels.
So if you're making a buying decision, the equipment connected upstream will be more of a factor in accuracy - at least the accuracy you are looking for - than the speakers' resolving ability.