Umm, your not going to brick...
the possible ways to fuck up are the following
Having a usb plugged into when using the installer
deleting coldboothax application
not confirming that haxchi was properly installed.
Thats it, you make it sound like it's extremely easy to brick. When now, its just about using a installer and not doing anything stupid.
no thats not the only advantage, you can setup a autoboot to anything I'm about to list. you launch to the homebrew launcher, system menu, mocha cfw directly, fw.img. You can boot to vwii system menu and vwii homebrew channel. So this means you can run the homebrew launcher at boot, which if you perfer to play with mods, comes in handy. Not only that, but it saves button presses. Because every single time you want cfw with haxchi, you have to select it, then hold a different button. And because coldboothax is at system boot. don't quote me on this. But it might be able to be used as a method for unbricking your console, since it boots straight to coldboothax, and not the wiiu menu.
yes, but your waiting over half a minute. Name a console that was good, that had a 30 second boot time. (I count the moment the power button is pressed on the console as booting) (and when I say good, I mean it had sold successfully and wasn't a flop)