It might occasionally have positive outcomes but this is rare enough I’ve never seen it. I have seen the far more likely destruction personally and repeatedly. You may assume there are close family bonds with such situations, but for someone who’s never worked child rearing is an unpleasant shift, time for nanny’s etc.

People picture retirement just early, but there’s many social structures built to support people leaving the workforce in their 60’s. A 15 year old who knows they will never need to work is set adrift, why exactly go to college or even get good grades in high school? In their 20’s it’s hard to maintain relationships with people who are unavailable most of the time and can’t suddenly travel on a whim. Spending time with others set adrift can be fine, but tends to result in extremes like BASE jumping, drugs, etc. Even hobbies like general aviation can get surprisingly deadly when you have extreme amounts of free time for decades.

Honestly, the negative impact on the individual is seriously underappreciated. It’s bad enough I am not handing personal wealth to family and advise everyone else to do the same.

PS: A possible exception is matching income. 1$ of inheritance per 1$ earned seems like it would mostly solve these issues, but I don’t have enough examples to know if it actually works and I am not willing to experiment on family members.