I was thinking about something the other day. Dalio recommends people to invest 30% in stocks with 55% in bonds and 15% commodities. But that stock/bond portion, isn't that pretty much equivalent as being in IG bonds? stocks and gov bonds blended together (high and no risk) are a low risk combination, that's pretty much what high quality bonds are
http://awealthofcommonsense.com/2016/02/the-greatest-bull-market-of-all-time/
The main benefits of going in IG bonds is that it might offer tax advantage (specially for non-US investors who buy the bonds outright instead of using an ETF) and its less distracting (since you won't see the stock portion fall)
I would think if one is thinking of flight to quality longer term, Bonds not the way to go at all cause at some point when interest rates going higher, value of the bonds goes down f you need to get out. Since so many of the Commodities are so low, I think this percentage be warranted to like 35% and go to much shorter duration financials.
Am waiting for the day when I put money in standard bank account and they say more I put in, more I owe for renting their bank for my funds, one day it will come.