I've contemplated this a few times but the small "what if" holds me back. Couldn't live with myself if I ruined my family's future. Super stays in traditional for now and BTC outside of it.
Discussion
It niggled me a bit but I couldn’t imagine going back, wrote this yesterday:
https://www.linkedin.com/pulse/dont-trust-verify-risks-superannuation-bitcoinsuper-io
Added a section the homepage of bitcoinsuper.io 
I think it's just the conviction in his bitcoin investment thesis. I know it took me about 18 months to really know that this is the best place for my savings long term.
Even with this knowledge, I still have a small niggling doubt & that I'm arrogant to believe I'm right over all these so called financial experts.
It's probably helpful to know that the risk of super funds collapsing or being pilfered is quite high given the trust placed in them & opaque nature of the industry.