A vacuum is essential, but the problem is that the manufacturer hasn’t considered that half the world’s population cannot easily open vacuum-sealed tins… If the designer had taken this into account, they would have made improvements to the design, such as adding a removable lever to the top of the lid. The fact that this wasn’t done is probably because nobody cared whether women could open the tins.
A vacuum is essential, but the problem is that the manufacturer hasn’t considered that half the world’s population cannot easily open vacuum-sealed tins… If the designer had taken this into account, they would have made improvements to the design, such as adding a removable lever to the top of the lid. The fact that this wasn’t done is probably because nobody cared whether women could open the tins.