[kipchak]

In that sense, isn't the 60/40 or Boglehead perspective also timing the market, in the sense that you are betting the regime of the past will continue into the near future?

To me the diversification hedge options (say GUNR) seem like they are helping you get closer to regime neutral. Or in other words you are giving up returns to cover more macro scenarios and betting less on what the future looks like.

[Marsymars]

In a macro sense, I agree with that, but it's very difficult to compete with Vanguard for the fees/overhead to hedge in more regime neutral ways.

It's effectively impossible to hedge against every possibility, including temporary drawdowns, while still having positive returns after inflation.