Just install an LTS kernel instead of the latest one. Unless your hardware was made literally yesterday you'll be alright, and the number and frequency of updates isn't far from, say, Ubuntu at all.
Also use archfi. It's a super easy and reliable way to get an Arch install going.
I dunno about doing a scripted install for anything but a moderately experienced Linux user. Going through the process teaches you a lot of important foundational stuff that you'll regret not having a good grip on later when you break something or want to go off-script. Mounting/formatting an fs and chrooting are things you should at least be cognizant of.
Eh, I don't know. On some level I agree but going off the present state of the installation notes on the wiki I can't help but feel like the importance is overstated since it's basically a list of instructions with little to no explanation of what does what. Eg. Chrooting. The notes just say change root into new system_ which means fuckall unless you then go read the entry about chroot and so on. Most people just treat it as one command after another, which imo makes it very replaceable with an install script. Of course, there's a right way to go through the wiki that is rewarding and genuinely gives you an understanding of your system but I don't know how many would go for it. I sure didn't on my first few installs.