Yes, this seems like it’ll cause resentment and arguing unless Shannon is already bought in. She reads the first line and maybe thinks “but why? I don’t like it!”. She only gets to the reasoning after she’s set against the decision and looking for reasons to disagree. The other way round, she reads about increasing team morale and thinks “oh, good, I agree”, then is more likely to agree with the decision.

If the boss can tell Shannon to deal with it like in the army, no problem. But in an office Shannon has lots of coworkers and bosses to formally complain to! Giving bottom lines which are in any way controversial in this manner will probably backfire imo.