The whole modern world, some may say capitalist world.. not just the uk is based on people working for as long as possible not as long as you want or need to, so that they can keep paying taxes and feeding the system, getting loans, mortgages, having kids with uni loans… it’s just anti compound interest.
Without side tracking.. if a person never needed to pay income tax but had to pay a correct level of tax for what they buy/consume, the FIRE would be so much achievable. But it’s just easier to group people and tax then accordingly and while they do it by grouping, that’s where the loop holes are and exploited.
If a young person never needed to pay tax, just saved their butt off they should be able retire 20-25% (the amount of time saved by not having to pay tax) earlier, freeing up their job for the next young person to do the same. But at the moment, we have generations of people too scared to retire as they may not have enough saved, causing a bottle neck in the career system.