There is a valid use of technical jargon: to communicate from one expert to another in clear words that leave no doubt.
Example:
When talking to a kid, a nurse should say: "You broke a bone in your left leg."
When talking to the surgeon that will fix it, that same nurse should say "Greenstick fracture of the left tibia"
The kid likely does not know what the words greenstick, fracture, or tibia means. Nor do they need to know. But the surgeon definitely needs to know all that information.
HOWEVER, there has developed another use of technical jargon:
To make the speaker sounds smart.
See, I know what a greenstick fracture is and I know the word tibia too! I must know what I am doing, you can trust me to do the surgery. (I am not a doctor, do not trust me to do any surgery, you will not like the results).
The problem is that smart people have long ago realized that inappropriate use of jargon means you are a lying con man, not a smart person.
For this reason, when I hear 'synergy' or any variation of it (with a few exceptions), I know the speaker is a moron trying to impress me. Many people think "CON MAN" rather than 'competent expert' when jargon is used, particularly the word synergy which was abused to ridiculous lengths by idiots with MBAs.
Note the main exception is in the middle of an explanation of why the synergy exists, as in: "If we buy a solar panel and a wind turbine, we can get just one backup battery. The synergy will save us about 5% of the total cost."