It’s a good job then that the State Pension is NOT a benefit.
Did you look at the link I supplied above? The state pension is classed as a Benefit (note the capital B).
https://www.litrg.org.uk/benefits/state-benefits
As Marlingford and Gladiateur note the term has been rendered pejorative by association with the ‘workshy’ but it’s essentially just a convenient word to describe financial help from government to individuals, companies and organizations: it benefits them.
The Benefits system to individuals (Welfare) is undoubtedly over-complicated, just look at the number available on that list, and I’ve a lot of time for the idea of scrapping the whole lot and replacing them with a Universal Basic Income. But that blue-sky thinking is likely to be crowded with airborne pigs.