I think you can can get too into the weeds with this sort of calculation.
I agree, that’s why I said the data is inconclusive in my opinion.
Until I see otherwise, I will assume bonds and equities have roughly the same currency risk.
If I am going to take on currency risk, I expect that risk to be rewarded. The fixed return bonds offer are not sufficient to match that downside risk.
I think someone already pointed out that bond funds don’t have fixed returns. They rise and fall in value, but the key point is that the downturns in their prices are less severe than for equities.
If equities had no downside, I would agree with you. The problem is that the volatility of equities often leads to panic-selling, and can leave you stranded when old age approaches due to sequencing risk/being unable to draw down funds during a lengthy equity market crash. Yes, bonds could well be lower in a crash too, but historically they fall to lower levels. It is that relative stability that keeps you sane in a crash and makes it easier to draw down funds with smaller losses.
The risk of panic-selling shouldn’t be understated, especially as the investor gets older and has less time to wait out the storm. Watching a 100% equity portfolio drop 65% in value during the GFC as VG1 did would certainly tempt me to panic and sell, unless I was your age. I know a couple of people older than me who did just that. One of them survived two crashes, but caved in the third one (at the start of the pandemic).
Essential point: it is not so much the lows of equities, as it is the actual depth of the plunge from the high point to the low point that freaks people out. At your age, you may think this is daft but you may feel different when you are older.
This video by James Shack, whom TBS on this forum mentioned, sums it up perfectly here (from 8:45mins in).
https://www.youtube.com/watch?v=Eac2jZcelQw&t=2s
I also am in my mid-30s. So my outlook is 35+ years before I start to drawdown.
By "retirement is still some way off", I didn't mean I was in my mid-30s.
How long is a piece of string, I guess
Anyway, I didn’t realize you were so young!
It puts your approach into a whole new perspective.
In your shoes, I’d probably be close to 100%-equities too!