Many people I talked to said that CD's just use mp3 codecs in the first place.
That may be partly true for non-original CDs made out of MP3 files via CD burner, but original CDs should not be "crippled" like that.
I think this debate is kind of late, at least a decade late. FLAC has clearly won; it is available everywhere and shall stay that way thanks to its open-source nature. With increasingly cheaper physical storage (SSD, HDD) and more affordable cloud storage, I think FLAC's longevity aspect just beats everything, even though there may be other codecs such as Opus which may provide a better compression/quality ratio.
But if you only care about lossless, just go with FLAC and enjoy your tunes. ;-)