Because HBL 1.4 is outdated now. If you want to update in the future the real HBL-channel is the way to go.
Exactly. And on top of that Haxchi isn't irreversible, and it can certainly be updated if need beI don't think this is entirely true.
1.4 is the same as 2.0/2.1 except it's elf vs RPX. Functionality and age are relatively the same and they both do the same thing essentially.