I think you are confusing dithering with floating point. Floating point exports will retain the ‘overs’ in tact without clipping them, but at some point you will need to limit and/or reduce the level. Dither should not be used when exporting a 32 bit file, and will NOT make an audible difference even with 24 bit exports. Dither should be used when exporting a 16 bit file (even if your tracks are 16 bit as the mixer is floating point as mentioned earlier), but even then the improvement is small. The importance of dither is often overstated and loads of incorrect information about it are posted on internet forums.
ffg’s post was spot-on.