Buzzwords, cliches, and adverbs are all things that can be categorized as fluff.
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Fluff is the filler between ideas that add value to the email. It can be as obvious as starting an email with "I hope this finds you well." It can be less obvious, such as starting a sentence with "I think." (If you think it, say it)
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The less obvious fluff are words and phrases like data-driven, strategic, etc. This might ruffle feathers, but these words need to add concrete understanding.
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Adverbs and hedge words are a different type of fluff. Sometimes, they're needed. A well-placed hedge word can *sometimes* create the right amount of uncertainty.
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Adverbs, on the other hand, are more likely to be unneeded fluff. Adverbs like "very" are used to add emphasis, but there is likely a better word to use.
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​Use them sparingly.
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You should know your audience, but whatever the buzzword/acronym/phrase, it can probably be stated in plain English.
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Avoid them. If your reader doesn’t know the term, you end up confusing them. Or worse, you'll make them standoffish because you made them feel out of the know.

​When was the last time a fifth grader talked to you about "synergy" or started dropping acronyms?