I don't think comparing state pension and salaries of £100k+ is comparing apples with apples.
Firstly, a salary is earned; you are paid an agreed compensation for your labour, skills and expertise. That is not the same as receiving an allowance from the government.
Secondly, those who complain of £100k+ not going that far is in response to an assumption that this is a huge amount of money. The percentage of workers who earn £125,000 or more is 3%, the monthly take home is £6,504., yet the 97th centile house is £680,000. A 95% mortgage on that would cost c. £3,500 pm leaving £3,000 to cover childcare (free hours lost at this salary point), food, council tax, insurance, clothing etc. etc. So, in short, the top 3% of earners can't afford to live like their achievements suggest they should due to property prices childcare, and a tax system that has not taken into account inflation, sneakily using boiled frog tactics to relieve medium to higher earners of their wages.
Thirdly, state pension is what is provided as a starting point. It should be enough to live on. But it shouldn't be, and no one should be under the illusion that it will be, any more than an amount to live a basic day to day existence. If you want more than that, save.