He's not saying there's no danger. It's friggin' space. He's just saying you're overstating it like all hell. If you wanted to really armor a ship you'd only armor sections anyway. You'd armor the engines, the magazine, the CIC, the sick bay, and other very important sections, and then leave the others flimsy enough that enemy fire flies right through, but can still be easily repaired relatively speaking. The targets have been and will always be something that causes a bigger boom or would cause confusion. Engines, magazine, or CIC.
You have a decent idea for having a combat protocol for having those on combat repair teams to be in pressure suits. You're flying off the rails for having ship standard design to have entire sections not be pressurized. There's no reason at all not to do that.Actually all sections could and should be manned, but it doesn't mean they should be pressurized.
No it isn't, considering that were we to actually consider a realistic design for a spaceship you'd have something a helluva lot more enclosed than shows like BSG or Star Trek would have us believe. That shell that penetrates would cause a lot of local damage, and everyone in the room easily would be dead.That is a completely different issue.