Full FIRE means building a portfolio large enough to cover your spending now. Coast FIRE means building enough invested capital early that you can stop heavy saving and let compounding do the rest.
Coast FIRE is often appealing when you want more flexibility before fully retiring. It can support part-time work, lower-stress jobs, or creative work without abandoning long-term independence.
Full FIRE is a cleaner end state, but it usually requires a longer accumulation phase and a larger portfolio target.
The right path depends on your timeline, expenses, job flexibility, and how much optionality you want along the way.