It's very true, as Jim once said (paraphrasing), buying US large cap growth has been an unbeatable strategy in the recent past.
It's hard to know how to project that into the future. I am actually overweight in foreign and small cap stocks. Not based on any insight except their PEG ratios seemed to be more reasonable.
Emerging markets are obviously dangerous to invest in, with fat negative tails. Still probably good for returns if all the swans in your investment lifetime all turn out to be white. I am good with China, going forward.
A while ago I had posted about NSRGY and RHHBY, since then both are up 20+%. Steady foreign large caps with regular dividends has recently been a good hiding place (again, only for me, may or may not suit someone else).

For a twenty-something, maybe VT isn't a bad choice. Or if they care about foreign tax credit (eg in taxable accounts), 60/40 VTI/VXUS to KISS. Time in the market than timing the market, etc. Oh and very important, put 80-90% in these, keep the other 10-20% in Robinhood for them to play with crypto, futures, options, meme stocks etc. So they won't get bored and gamble with ALL the money. I am not kidding. Even Ben Graham (paraphrasing again) said that the main attraction of rebalancing or a regular system of trades is that it gives the investors something to do. His emphasis, not mine.