Retiring at ~30 with less than a half mill banked is just plain silly. Who wants to live at or below poverty their whole lives? So you're not working, you also can't afford to do anything other than sit in your tiny place and stare at the walls or read library books. Do you want to get married or have a relationship, kids? Good luck finding a mate who would be on board for this lifestyle.
"Retiring" from a career you don't love at ~30 with 300-400K and a very low spend to explore what else life has to offer is an amazing option, especially if actively looking for more interesting and satisfying sources of income.
No one would consider doing this if they were happy in their career and life, so obviously doing something else is a really reasonable option to consider.
Says the 30-something who left their own highly lucrative full time career, lives in a 1 bedroom, reads a lot of library books, and has a really great life.
If OP spends the next few decades discovering fun and profitable hobbies like myself or MMM, and generally doesn't touch their 'stache too much, they'll also probably end up with the same problem that myself and MMM will have in our senior years: way too much money.
The world is filled with amazing things to do, and you don't need a net worth over 1M to start doing them.