C2077 [SPOILERS!] Effectstacking a bug or a feature?

Even if you didn't go crafting route you might have noticed something.
Effects do not rewrite and apply the highest one but stack onto each other.
Which means you can apply several critchance equipment mods and combine perks to reach 100%, and then go skyhigh critdamage. Instakill bosses.

Additionally, there is a pistols doubledamage perk (though superuseable on onebullet ones) that makes things even more ridiculous.

The game gets pretty easy on normal soon after the start even without mods and using just perks.
With perks and mods combined you can basically deal 100K damage midgame and there is no trashmob with such high health on that difficulty anywhere in the game.
Does anyone play the game on nightmare? Are instakills a thing there too?

I honestly believe this stacking is a bug. I mean, how could this pass through betatest?

I'm guessing it's probably a bug.

Another one I've noticed is that enemies will often drop a gun and yet still have that same gun in their inventory, so you end up getting two of them. A very obvious glitch that I'm surprised hasn't been fixed yet.