Why is it so hard for some people to change their usage of some words? For me it seems pretty simple and technically speaking the alternative/new words are stil

Why is it so hard for some people to change their usage of some words? For me it seems pretty simple and technically speaking the alternative/new words are still understandable. It's not like in this industry it's uncommon to have to learn and adjust or dismiss prior solutions when new better ones arise. Big deal over mostly nothing imo.