You said "was designed to be completed by stealth perfectly." This is false, you said nothing about player mindsets before.
Well, what I meant was the GZ mission I told about has everything needed to be completed only by stealth.
Game doesn't force player to go stealth, but if player prefers stealth and will try to complete the mission by stealth, then he will not be disappointed.
Going by force is completely optional. And that option works effectively too. For me it's too bloody and noisy, but some players prefer that kind of playthrough.