> Just save a ton, buy whatever stuff truly makes you happy, and your savings give you flexibility.

Retirement simply means that you could just live off of your savings interest. But that doesn't mean that you have to stop working.

For me, this is about three things: 1) Prioritizing joyful experiences, social connections, self-development and happiness over (expensive) material possessions 2) Being financially responsible, knowing how much I earn, owe, spend and save 3) Maximizing future life options involving less well-paying jobs (working part-time, retiring, taking some time off, starting a new career, whatever) when I get bored/burnt out of my current career or get health issues, need to look after a family member etc. So much can happen in a life.