Originally Posted by
Lyman
Assuming poor piloting (the BUS does that subrosa, yes?)
No it sodding* doesn't. It has an interface that is designed in such a way that there are backstops to prevent inadvertant departure from controlled flight in the vast majority of cases, and to assist the pilots by taking a degree of workload off them during the more tedious portions of the flight (as has been the case with every airliner fitted with an FMS since the '70s).
If you continue with these wild generalisations, then I'm going to have to assume that you are simply trolling to create an argument and I'm not willing to rise to it.
* - I hope that expletive is within acceptable boundaries, mods!