We should not bend over backwards to use language the way anally retentive people demand we do.
I'm a descriptivist. I don't believe language should have arbitrary rules, like which kinds of words you're allowed to end a sentence with.
However, to be an honest descriptivist, you must acknowledge that words are used in certain ways more frequently than others. Definitions attempt to capture the canonical usage of a word.
Therefore, if you want to communicate clearly, you should use words the way they are commonly understood to be used.
True. And that's generally how they order the definitions in the dictionary, in order of usage.
For example, "an unfounded or mistaken impression or notion" is indeed the 2nd definition in M-W for "hallucination", not the first.
So does pedantry and prickliness.
Intelligence is knowing that a tomato is a fruit, wisdom is not putting it in a fruit salad. It's fine to want to do your part to steer language, but this is not one of those cases where it's important enough for anyone to be an asshole about it.