When people look up and misunderstand the meaning of a word, they base their interpretation on what they already know. So they are likely not to absorb a new concept but only get a new way of saying an old one. That means that the redefined word is likely to be an inferior tool on average.

It's also the case that just losing the utility of something hurts, regardless of the merits of the replacement so it's subjectively inferior to someone like me - getting older and crankier, you know.