Bit reduction is not a bug or defect on the Digitakt. It is a common effect with many different synths and effects boxes, implemented differently. The Octatrack has something like it. Some people just don't like the sound of the implementation on the Digitakt, and would prefer a different effect or implementation. There's lots of sounds and effects implemented on the Digitakt that many people prefer over the implementation on the Octatrack. The great thing is you get to listen and pick what you like.
I could see Elektron improving the Bit Reduction on the Digitakt, or maybe not. I think it's good to use sometimes, depending on the particular sample and the sort of thing i am looking for. Cenk sure mashes on that knob.
Also to be clear, the Digitakt is a stereo machine, it's the sampling and samples that are in mono.