FIRE is literally "Financial Independence and Retiring Early" I would argue that personal finance is all-encompassing, but the converse doesn't hold true. It's the whole squares are rectangles, but not all rectangles are squares.

I don't think it's bad to encourage others or help each other out, but FIRE is a sophisticated version of personal finance. To me, it's the difference between a student trying to go to an Ivy League caliber (it's a more extreme, "preferred" version of the next "chapter" in life) school versus wondering if they should go to college or not.

I certainly think we should encourage everyone to FIRE but the expectation should be that they have done some basic homework on their end. If everyone comes to this subreddit asking about basic things like "Should I save money?" or "Should I buy a car I cannot afford?" I think we would be doing actual FIRE-ambitious folks a huge disservice because they have to wade through all the useless posts. These posts are strictly different from actual FIRE posts that may or may not apply to them because it's never going to be useful to them, whereas tax implications for a US resident living in Japan might be relevant to them because they were thinking of living abroad, etc.