Just came across this brief read, the substance of which will be familiar to many. Warren Buffett has long been a proponent of the S&P 500 as a solid investment vehicle, such that it's the substance of his directions to his trust for his spouse, a mix of 10% Gov bonds and 90% S&P 500 tracking vehicle of low expense. This is a different approach that what most associate with John Bogle, who included (unclear to precisely what degree) and element of global exposure.
Personally I think it'd be tough to go wrong either way, and past long term performance would suggest either approach would have won over the past 30+ years. The only addendum I'd make is to Buffett's approach as outlined in the article. Even 10% in bonds of a massive trust fund makes for a lot of potential liquidity. I'd have to imagine that the likelihood of ever even having to touch the S&P component has to approach zero, i.e. super duper long term outlook.
[https://finance.yahoo.com/news/warren-buffett-said-90-wifes-102500696.html](https://finance.yahoo.com/news/warren-buffett-said-90-wifes-102500696.html)