FWIW - Don’t think that the 60/40 is dead because of the rise of exponential tech but rather because of rising inflation around the globe.

You can clearly show that the stock-bond correlation becomes significantly positive once you cross a certain inflation threshold (around 3% <)

No diversification in a high inflation environment.

Plus, average real performances of both stocks and bonds become negative above a 5% threshold.

Only remedy is to diversify into hard assets like #bitcoin or gold.

Ignore at your own peril.