I have made a couple of visits to United Home Audio UHA), a company that specializes in refurbishing and making their own improved electronics for R2R machines. The most interesting demonstration involve playing a record on a very high end vinyl set up and comparing the sound to a tape recording of that same vinyl setup playing that record. The UHA folks think that the R2R copy sounds better than the vinyl original. I did not agree (the vinyl original sounded a bit more dynamic) but I can see why others might prefer the R2R version which was very open and airy sounding with a pleasant relaxed quality to the sound. Of course that means the recording altered the sound, but arguably, it improves the sound. In any case, I enjoyed the R2R sound a lot. Since that visit UHA has gone much deeper into improving the electronics of refurbished machines; top models approach six figures.
This reminds me of an interview a magazine presented of three recording engineers. All three agreed that high resolution digital recordings sound much closer to the sound of live microphone feeds than do the analogue R2R recording when doing instantaneous comparisons. But, all three agreed that they liked the sound of the R2R recording more than the digital version.