I can say the same that after 40 years of studio work my days of using Genelec's are over. I need speakers to be pleasant on my ears. However mixing and mastering is one thing, working on a modular I want to hear the whole spectrum that my ears are able to detect. When mastering a production unfortunately there is a window one must adhere to. Humans are in general cabable of hearing down to 20 hz, although a trained ear will go lower.
If a sound becomes unpleasant the same goes for a very low frequency as any other, then we need to fix it. An important thing to keep in mind is that just like an lfo which is inaudible to us mere humans but will still affect the audible register dramatically. A problem in the bottom end will have damaging results in our audible frequency spectrum. With a speaker system that does not hide those things from us, we can make use of the amazing possibilities that truly are there, if only we can detect them, hear them.