To my mind, there is nothing wrong with majority of people falling to some range. We can still make sense of it, looking at the levels of distinction that will ever be present.

Otherwise, we risk losing any common anchor, which is very important when we talk any point of statistics or want to trace dynamics and trends of political thought.

Taking some of the extreme examples, in USSR you would be "right-wing" for wishing to open your small business, and in modern US, you would be "left-wing" for wishing to make healthcare more affordable to the poor or have minorities heard. In fact, USSR was just full of people on the left, and US is full of people on the right, driven by propaganda, political technology, media, communications, genuine core beliefs etc.

Updating tools could be about bringing more clarity to some new formations and events, but it shouldn't be about constantly redefining the base values.