Well, many younger people cant afford to get on the property ladder and rents usually higher than a mortgage so for them there's that.
Then theres the age at which you get it. My parents retired in their late 50s, my grandad raised two children, built savings and owned a home as sole provider, my other grandparents were the same. And my grandparents got their state pension at 60.
Then theres miminally - council tax, gas and electricity, water bills and food. Which I think could easily be £750 a month.
Most people reasonably want more: Internet, TV streaming, phones, cars (which come with insurance, fuel, MOT and tax) pets (which come with insurance food and vet bills) new clothes.
Before you think about occasional trips, presents for birthdays, christmas, maybe a holiday.
If you own a home you can probably survive on state pension. Just.