Seriously, what don't you guys understand that personal finance is personal? That different persons can have different priorities? Is there simply one doctrinal law that we all must follow?
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Is financial independence, indisputably, the highest priority? If you think so, why? I know plenty of friends who could give two shits about FI and they are incredibly happy with their lives. They save their 10% and they are happy to work to 60 just like their dads.
Is investing in index funds truly the correct decision (what about rental properties or active investing)? I have friends who don't want to bother with doing everything on their own, and happily pay a fee-only advisor to manage their money. I have another friend who refuses to invest in the stock market and only buys rentals. Are they wrong?
Is never eating out truly a better long term decision than socializing? The other attorneys I know who enjoy their practices the most are the ones who are always at wing night, the bar association social events, golf outings, etc. These all cost money. Are they wasting it?
Is doing anything other than biking inarguably not correct? One of my friends makes $80,000 a year but drives an incredibly slick BMW. He loves the damn thing almost as much as I love my son (not that much, but you catch my drift). Is he wrong? If so, why? Why is his passion for cars incorrect?
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People on here act as if there is a single correct answer to all of these questions -- as if MMM is the New Testament. You know how evangelicals cite the Bible to prove they are "right?" That's how hardcore "mustachians" sound when they fetish over FI, as if work is the worst thing in the world, and that we should all not spend anything on anything until we reach the virgin mountain of FI.
This is, of course, a bunch of hypocritical BS, because I have absolutely no doubt we all do things that aren't 100% "optimal." If you're eating anything other than rice and beans, you're being sub-optimal. If you subscribe to Netlfix and Hulu, you're being sub-optimal. If you take your family on a ten day trip to Europe, that will delay FI, and is sub-optimal. If you own a car, that's sub-optimal -- biking would be cheaper.
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Of course, we all know ourselves. We know our mental and emotional well-being. Some of us can eat rice and lentils every day because it would make us go mad. Many of us go out with co-workers and friends to keep in touch. Many of us live in comfortable houses. Many of us drive reasonably nice cars (seems to me most on here own Toyotas, Hondas, or Suburus). Many of us pay a premium to live in districts with good local schools.
These are all personal decisions based on our own priorities. We find a balance. We are informed and we make deliberate decisions.
The mortgage payoff versus invest decision is just another one of those decisions. The pros and cons of doing so are well discussed on here, so I won't rehash them here. But to think that you are indisputably "right" solely because the hypothetical math on a spreadsheet says "you could theoretically have a higher net worth at [insert date]" is the height of narcissim. You are imposing YOUR beliefs and YOUR priorities on others, the same way someone could look at you and point out all the "sub-optimal" things you do.
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What the OP in this thread did is not a per se incorrect decision, because these largely do not exist. Decisions are a reflection of our priorities. If someone prioritizes not having any debt versus hypothetical future returns, that is their right -- in much the same way it is my friend Paul's right to not care about FI, for my friend Ben to love his BMW, for my attorney colleagues to love spending hundreds a month at bar association events, etc.
Personal finances are personal. People have different priorities. There is no one correct answer. We are humans.