Well, when you're young you don't kinda take on board retirement and pensions (private and state) etc.. So when I set out working, the first year was YTS (Youth Training Scheme) that paid peanuts as a wage. That meant I earned under the lower earnings limit, not enough to cover my stamp for state pension. I received a letter to say I fell short on some ninety quid for that year but I don't have to pay it, just means it lowers your final state pension. So as a young man I thought, "Pfft, I don't have to pay it so I'm not gonna". On hindsight, I should have been forced to pay it.
My private pension matured late last year, so now I can just work part time, and fully retire when I hit state pension age.
In the UK, if you're employed you are automatically enrolled into your employer's pension scheme, they must provide one and it's up to you to write to the pension regulator to opt out. It's called the, " We're All In".
Imo, it's the start of the UK government scrapping state pensions. Over the decades, the rules will change, you won't be able to opt out, then contribution percentages will increase etc.. over the next few decades. But I can guarantee this, if/when state pensions are scrapped, the tax burden won't be any less. National Insurance contributions may cease on pay slips but it'll just be collected from elsewhere.