Of course, I'd never tell anyone not to pre order, they're free to do as they please
Doesn't mean its always the smartest thing to do though, and it doesn't mean there are not negative things in the industry because of it (pre order bonuses existing at all, for example)
If you know the track record behind a company like Bethesda, and you pre order Fallout 4, and it's a broken mess on release, then really you have no right to complain, because they do this every time and you keep pre ordering the game anyway
You can't expect them to change how they operate when you reward them regardless