Because English is half a dozen languages wrapped in a trenchcoat? A lot of the law related words are from French derivations AFAIK?
Domain specific language is found across all realms of society, even firefighters have words or phrases with a specific meaning (back-burning, pumper, appliance, etc). So maybe its not that some areas are lazy, its just that you haven’t been exposed to their more technical side?
Get/borrow a thermal camera, and use that to see where the heat is coming in. Some libraries have thermal cameras, but that might be rare. You can also get very cheap and nasty thermal cameras from Aliexpress for $60 AUD