Well I'd tend to agree with the poster, cash has turned out to be about the best fund to be in for the last decade or more. One problem would be when the decision to exit equities was made, several years ago would be good, the last 12 months or so would be not so good.
Fine equities, long run, outperform etc. etc., in reality anyone whose pension contains the last 10+ years has a serious problem, the next 20+ years needs spectacular growth to correct that non performance. They might even have a shorter period to make it up as they're advised to start moving to cash 10 years from retirement anyway.
Funding a pension via larger pension contributions to cash funds, rather than smaller contributions to non-cash funds is a logical choice if someone is in the position they can afford to do that. At least you know where you stand and where you're likely to end up.
I think it's very odd that it costs more to keep a pension cash fund due to pension company charges than what the government will extract via DIRT in a normal deposit account. I really don't think there should be anything but a nominal charge for cash in a pension fund.
For example DIRT on 100k at 3% is 30% so around 1k per year and you end up with 102k.
Charges on a cash pension fund where you might only get 1-2%, is 0.75 so you end up with maybe 101.5k.
[Also for the next three years there's the pension levy of 0.6%, you might do well to end up with 101k as the deductions are close to 1.5%]