I doubt that high efficiency speakers and good low level detail are absolutes. It’s likely more important that things like the amp being a good match to drive the speaker impedance, the system has good resolution, and that phase coherency and overall clarity of the speakers are excellent, along with a suitable room acoustics, etc...all are still significant factors regardless of the speaker efficiency.
Audio is complex, and it’s rarely as simple as isolating one parameter and calling it good. There are always good and bad examples and pros and cons with every principle you can name, and every choice you can make.
Thanks for the feed back to my question, @knotscott .
I would never buy a speaker with a sensitivity level below 92db. Please pardon my lack of knowledge and inexperience as a technician, but lower sensitivity speakers, at least in my experience requires the amp to bring them to life. Oftentimes I have found this to sound lifeless , requiring me to jack up the amp to breathe some energy to the presentation.
Thank you also, @judsauce , for your feedback.