Maybe it's a cultural difference, but excepting dysfunctional relationships the idea that your close friends and family are the wrong people to give you advice is almost dystopian.
Kind of like a one night stand, same principle (though much like a real relationship is much more rewarding, it's also a lot more work, the parallels here are fairly apparent)
It's also amazing how much good you can do for someone by just listening to them for a bit, and then deploying the correct platitude. No originality, no great wisdom, just the right thing said at the right time, from someone whom the listener doesn't have years of emotional callouses, defenses, and preconceptions built up to prevent them from hearing the simplest of words without hearing the echos of years past.
With a bit more effort you can do even better, of course; I'm not trying to oversell the goodness. I'm saying the bang for the buck can be surprisingly good for people.
First, I probably know what a family member would suggest (by being close, observation, partial answers of related questions). That "indirect advice" is already baked in. Second, more data points can helps. Last but not least, with family and friends you lack anonymity and it could be nontrivial to ignore advice of a family member on a serious matter. I do not see any of this as dystopian.
As an anecdote, where I grew up train travel was common, generally safe and tickets cheap (and at 16 you were a full adult and can go alone wherever you want / can afford). On long train rides folks would often discuss things and open up in a way they would not do with a close friend. "Train conversations" was a phrase in common use suggesting it was not rare.
The assumption here becomes that what worked for your parents (even if your relationship is good with them) won't work for you. Worse than that - they don't know how to do better because if they did, they would have by now! For dysfunctional relationships it's worse - the cultural message of "strike out on your own" becomes inferred as "you think you're better than us" and "you're just a social climber". The analogy of a pot of crabs that keep clawing each other back into the pot so that none escape is not a metaphor in the lower socioeconomic strata. It's an observable phenomenon that can make a foot note in your own family history.
In short, unless you want to end up exactly where your friends and family are - they're not the ones you want to be getting advice and ideas from.
I’ve been trying to crack the nut of a mechanism for friend finding that would actually be socially acceptable and cool, but any real solution would never be considered a great business idea, because the goal is for people to not need it anymore.
Having real friends who are with you through thick and thin is so critical. Most people just have a bunch of acquaintances that they drink with.
Oh you like mountain biking? Here are 15 other 28-34 year old mountain bikers in your area.
Have you heard of SCORE (Service Corps of Retired Executives)? They provide business mentoring, mostly to small businesses and people considering starting such businesses.