The idea around the Time Capsule is fantastic and I will admit Apple did an excellent job at deploying it even if it is just a glorified NAS. I also do agree that it's horribly designed. It has no ventilation so if the power supply does not burn out, the desktop grade SATA hard drive does.
Also, the recommendation to backup your backup is stupid for 80% of consumers since it's dumb and expensive to buy a second Time Capsule to backup your other Time Capsule. I'm part of the 20% that does have multiple backups because I know what the fuck LTO3 Ultrium is and how to schedule weekly backups.