If you mean the £12.21 a week one, that figure takes for granted that a person is able to save a sum which is admittedly small, but will nevertheless be out of many people's reach, as would any sum at all.
I hate to break it to you, but there are many, many people today in low wage Britain earning barely enough to feed and house themselves, for whom even £12.21 a week (aka £48.84 a month) is too much. Why do you think debt happens? Or people in full-time work needing to use food banks? Do you think they can magically conjure up £48.84 a month?
If you think everyone is capable of saving no matter how little they're paid, you're shockingly out of touch or perhaps just indifferent to other people's hardship because it doesn't affect you personally.
Regarding the state pension, I neither claimed to have a solution nor that no changes would need to be made to the current model, so your question is irrelevant. It's your blinkered attitude that I'm objecting to.