Why?
Reasoning seems sane enough to me...
Well, the way it reads to some of us ("I don't want to spoil my experience, so I'm not experiencing it.") seems a bit odd.
(Along with the idea that, if you've only gotten to level 2, just how much of the game can you actually have "experienced"? Or did you install a "gain no XP" mod?)
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As for the original question:
I've seen quite a few questions concerning "sniper builds".
They tend to encourage the use of stealth.
This puzzles me.
I thought that when sniping, you were too far away from the target for him to actually do anything to you. Why sneak?
There is one main factor - the game gives you a massive damage bonus if you hit an unaware enemy while in Stealth. So, if you want to snipe people most effectively, you need to be in Stealth mode, even if you're so far away that they don't see you even out of Stealth.
An additional minor factor is that, when you're crouching in Stealth mode, you have a bit less sway in your gun aim.
And sound suppression just gives you a better chance to stay in stealth if you 1) miss, or 2) want to shoot multiple targets without them attacking you.
(Which, honestly, makes no sense. I don't care if I'm hidden and my rifle is silent - if I splatter a raider's head all over a clearing, the guy standing right next to him should react, dammit.
)