Zoom is not the same as focal length. Please read up on the very basics of photography, especially focal length. Borrow a book or use google to learn more. You'll realize that wide angle is not everything. some people want longer telefocal reach.
Just read the above link and i think it helps. Btw hood is to 'prevent' flare, but to me it just an accessories to make your lens look bigger "Pro". To me it is the same as why use battery grip.
Some info, a Nikon 70-200 and those with gold ring/ red ring, they tend to have better IQ which make your focusing much faster and brighter. AFS doesnt mean fast. f2.8 make photography in dark places a better shooting environment. Not all places allow flash.
I think you meant lens hood.. A lens hood is typically to prevent flares in conditions where there is alot of sunlight..
The kit lens cannot give them the same range as a 70-200.. Do note that these two are worlds apart. Literally $1000 apart. An 18-55 is mostly a walkabout lens, with not much range, and when you don't have much space to work around with and you need to get a longer range, you'd get a 70-200.