The Swiss Army Knife is known for its versatility and wide range of tools, but opinions on the usefulness of specific tools may vary depending on individual needs and preferences. That said, one tool that is often considered to be less useful compared to others is the corkscrew.
The corkscrew tool on a Swiss Army Knife is designed for opening bottles with cork stoppers, such as wine bottles. While it can be handy in certain situations, not everyone frequently encounters corked bottles or requires a corkscrew on a regular basis. Additionally, some people may prefer to use dedicated wine openers or alternative methods for opening bottles with corks, making the corkscrew tool on the Swiss Army Knife less relevant for them.
It's worth noting that usefulness is subjective, and what may be considered the least useful tool for one person might be invaluable for another, depending on their specific needs and circumstances.