I can see that, you make a fair point. Centrists are probably the least homogenous group by definition, so they don't really stand for anything in particular and the label loses meaning.

However, I do think there is something to be said for using the centrist label to dodge around people trying to pigeonhole you into a specific viewpoint. For example, I've had great discussions with someone about UBI and socialized healthcare before, only for them to feel utterly betrayed and revolted by my stance on gun control (as they naturally assumed the rest of my views would align with theirs along their party lines).

Our political culture is so incredibly hateful and polarized at this point in time that I feel like 'adopting the role of a D or an R' for a single discussion is a recipe for disaster. If there's anything people instinctively hate worse than an enemy, it's a traitor.