Mosin, How about defining a "neutral" component as one which has "no discernable character of its own". In other words, one that does not add or subtract a sonic signature to the music.
This may be impossible to achieve, but I do think it is a reasonable goal. One way I would describe a turntable that is too fast or two slow is that it is not "neutral". Such a turntable would impart a color on everything it plays. Some would probably say the same about particular drive types and certain build materials.
Now, if one likes having three platter options in order to alter the sound to his/her personal liking, that is fine. But for those who want to hear what is in the grooves without any alteration, it does not seem to be the best approach.
I think neutrality is a worthwhile goal for a designer. Not the only goal perhaps, but one which will meet a demand in the market. And because it is so difficult to achieve, I don't think there is any chance of everything sounding the same.