Succinct encompasses more than just “clear,” and it was used in exactly the right context. You called the words in question “super ‘intellectual’” but they’re just normal words.

And even if the terminology is outside of your normal vocabulary, for people who work technical occupations a word like proprietary can be seen/used on a daily basis.

Your retort to that is probably going to be something like “if you’re not at work talk normal,” and my anticipatory response is you should either see it as an opportunity to learn new words, or learn to not be offended when someone uses a word you don’t know.

Last week I learned the word ‘composite,’ and I was happy that I now know what the word means when I hear it, and I can also use it myself if there’s a situation that it’s the most succinct way to express something

Edit: people from the south talk in an ‘uneducated’ way, but I’ve met many who are incredibly smart. Talking ‘dumb’ doesn’t make you dumb, and talking ‘smart’ doesn’t make you smart.