@Francis,
If you read the part about VITAL information and reports you see what I mean. I wrote instruction manuals for machines and simplicity is needed for too complex a sentence and the technician would either scratch his head or press the wrong button. There had been many industrial disasters resulting from wrong interpretation of the instructions. Don't forget the people who run the machines are less capable of than the designers. Of course, if it is complex it will be complex but to unnecessarily densify the prose is snobbish.
Basically, it boils down to whom you are wring. The reading audience dictates how you write. To the enemy you would write to hide your intensions so you would write in code or provide disinformation. To your boss you would write differently. To your loved ones you write very differently. To those of simpler minds you need to write simply. To be conservative or to be on the safe side in order to avoid misunderstanding it is best to keep it simple (KISS was the rule).