" My excuse - I was busy running a business and having kids, and decided to farm out investment management*. Longleaf seemed to fit the bill - value investors, concentrated portfolio, "eat their own cooking"

That was my exact scenario 25 yrs ago +/- and I had a similar, but briefer experience with Longleaf and many other highly regarded so called Value Investors. I say 'so called' because after you got invested with them and got passed all the rational sounding pontificating.... that is really marketing....they were very far doing what smaller or younger Buffett and Munger would do. I had studied Warren and Charlie for decades, but like you was busy running a business and raising a family. Once I got all of that squared away I went to full-time investing the Munger way and it has outperformed all the previously referenced investors and the SP500 TR.

JP Morgan has a GARP fund (JPGSX) which is not an unmanaged index, but is plenty diversified and has outperformed VOO. If I became incapacitated, I would direct a sizable portion of my portfolio there. Strangely enough, I only really learned about that fund because AI Chatbots used them as a comp for my own funds performance, so I looked into it a bit.