Index funds are not risk free! We have had a solid 15 years and everyone forgot that there are decades of declines or stagnation.
That's why you hedge with Bogleheads three headed fund. Bonds are strong when the indexes are weak according to them
LFSPA is a cap note, not an index fund. Hence the lower returns, haha.
Not saying it's necessarily the ideal vehicle but anything beats the banks.
I would happily have a decade of declines or stagnation on the 10's of 1,000s in the kids account over the next 20 years - they can then invest in their productive earning years in companies trading at p/e's of 10 again.