To be an executive is to be responsible for execution. Someone who allows major blunders to happen under their watch is not a successful executive, whether they were personally responsible or not.

You can't make excuses as an executive. You can't say "there wasn't enough quality control," because you have the power to create the quality control process necessary to prevent the blunder. You can't say "I wasn't aware there was this risk of keyboard defects," because you have the power to create reporting structures that will surface such risks to all key stakeholders, including you. You can't say "I didn't have time to focus on functional deficiencies or risks because I was focused on aesthetics," because you have the power to hire and delegate to the most talented employees in the world; you have the power to do whatever is necessary so that you do have the time to focus on what needs to be focused on. You can't say "I didn't worry about functional risks because I wanted to focus on design," because your job is to execute, not to do what you want to do.