Retirement you can plan for and start cashing out so you're not locked into a pension fund. Also by retirement you would hope to have a few options to choose from. The other shit you can't plan for (hence my desire to hang onto the zombie apocalypse shelter)
Most people i know have retirement sprung on them by virtue of a redundancy package. If your pot is 40% down in peak valuation it wouldn't be a good time to take you 25% tax free lump sum or buy an annuity.
No wonder companies were desperate to get rid of the 'gold plated' pensions.
Unless you retire/need money during a recession or crisis.
They happen quite often..sadly.
Timing is key.