I would not be so brazen as to call the engineers behind this "average" or their work so. Unless you can make the argument that a plane would fly for 51 days straight, being required to reboot the on-board systems is not a major deal-breaker, especially as the larger Boeing's take 60 minutes to refuel.

The engineers behind Boeing planes have built an incredibly sophisticated machine which omitting a very nessescary but not so inconvient task of rebooting every n days, performs its primary directive well.

Every component in an aircraft require maintenance and inspections after so many operating hours. Why should software be any different?

Chill out..