In this case I wouldn’t associate the poor usability with the designers, I think its down to big business not caring. Plus it costs more to make a UI good, and flexible for different user situations. They’ll also hire the cheapest designers. It’s all about saving money and more profit. Their main aim. And in the case of monopolies, people can’t go elsewhere. The problems all come down from the top.
English is slightly ambiguous here. As tighten has 2 meanings. Turning a screw clockwise is to tighten it, as opposed to loosen it anticlockwise. But it’s quite loose. Finally, to make it tight and secure, you tighten it with one last turn.