One example I experienced of audio sounding better without dither on export was when I opened a 24 bit 192 khz transfer of a 50 or 60 year old analogue tape recording (purchased from “High Definition Tape Transfers”) in 32 bit float just to add 30 seconds of silence at the end of the track. Exporting at the original resolution with the default dither settings produced a sound noticeably lacking in the excellent transient attack and rhythmic drive present in the original file, but exporting with no dither solved this problem. One confounding factor might have been the presence of tape hiss in the original recording, and another might have been an unknown amount and type of dither (or perhaps none at all, in view of the existing tape hiss and the high resolution) added during its original digitization.
Since then, I have used a chain to apply an equalization curve (about 11dB cut at 85Hz, rising steeply to no effect below 60Hz and no effect above about 125Hz, but preceded by -2dB amplification because the curve, which showed no boost, was nevertheless occasionally adding up to 1.7dB somewhere or other, causing occasional clipping) to thousands of 16 bit and 24 bit files (in order to optimize them for replay via modified Quad ESL57 loudspeakers on non-standard supports placed fairly close to room boundaries) always using no dither on export, and I haven’t yet noticed any loss of sound quality in any of the exported files. (However, I haven’t tried any fade-outs!)