It is good to use a large vocabulary with precision. But what does precision require? Your audience needs to understand your words. Emotions are best described

It is good to use a large vocabulary with precision. But what does precision require? Your audience needs to understand your words. Emotions are best described in the simple and direct language that they respond to. Therefore, simple language is usually best. Many exceptions exist. Jargon should be used in a professional context. Archaic language helps to set stories in the past. Your point may be enjoying the complexity of speech. For example, Terry Pratchett would not be Terry Pratchett without excessive footnotes. Gene Wolfe's Book of the New Sun was loved in part for words like those in https://www.wolfewiki.com/pmwiki/pmwiki.php?n=WolfeWiki.ObscureWords https://www.wolfewiki.com/pmwiki/pmwiki.php?n=WolfeWiki.Obsc.... But exceptions are exceptions because they are exceptional. Most of what we say is not exceptional. You say that expressing yourself in simple language "feels like gate keeping to understanding personally." I find the opposite. Complex language often hides muddled thinking. It takes work to clarify my thoughts into simple language. Once I have done so, my understanding becomes more precise. Therefore my thinking has been improved by trying to speak simply.