So is the problem with Tyler's projections that they are too pessimistic, or they suggest the wrong asset allocation?
If they're pessimistic but help me pick the right asset allocation, I can live with that. (I do live with that. I lazily skate along on what appears to be juuuust barely enough to not work.) If my asset allocation's wrong, I could be in trouble.
He starts from the assumption that you'll be getting 15th percentile returns, according to the post. The end result of investing with this assumption and trying to limit drawdowns is going to be suppression of overall returns, which for most people is going to mean working much much longer.
By the same token, why not assume 15th percentile life expectancy? It boggles the mind that people are so concerned about their money surviving a 50 year retirement to age 100 that they'll work multiple extra years to get to 2.5% WR or whatever. There is almost no chance you'll get to enjoy that year you spent working, because there's almost no chance you live to 100.
If you're going to be pessimistic, at least be consistent about it.
As to whether the AA recommended is useful, I'd also be cautious there, given that limiting your dataset to 15th percentile return periods is going to shrink the available data to the point that you're overfitting a lot of the time and the portfolios that did well are just happy accidents. This is a legitimate critique even if you're
not limiting yourself data-wise, there's just not that much data (maybe 150 years worth, if you're willing to use 19th century railroad boom/bust stock market info which probably isn't similar enough to modern day to be useful).
You can always create great portfolios in hindsight/backtesting. In fact you can create tons of them. That doesn't mean they'll do well going forward.
To me, to be worth considering, an AA must be:
-Extremely simple, with no more than 3 or 4 asset types held.
-Easy to implement even in uncomfortable situations/down markets - if you just cling tighter to your gold when stocks are down, rather than selling it to buy stocks, you're not doing yourself any favors. Goldbugs always think things will get worse.
-W