If I'm not mistaken, mp3 uses a compression that filters out frequencies that are near-impossible to hear if you are listening casually. On top of this, some listening systems take advantage of this average frequency drop and might not supply speakers tailored for the frequency range that mp3 drops, if you will.
so, what's the point of lossless codecs if your audio playback equipment might not even support the benefits of lossless?
Why bother? Lossless is really only good for original sound sharing, recording live audio, and for sharing a file suitable for multiple codec conversions.
Feel free to correct me if I made an incorrect statement anywhere