No but what rate it growth do you need to provide the above? And what amount of volatility are you willing to expose yourself to? Are you fucked, mentally and/or financially if your assets drop to 40% of their current value for an unknown period of time?
Returns are returns, some people are happy to beat inflation, some people want double digits. Trackers (such as the S&P
500) will have made you near the latter since the end of 2009 but still had a couple of years of double digit losses during that time.
The best investment, especially with regards to retirement planning, isn’t the asset that makes one the most money. It’s the one that provides the best return per unit of risk the investor is willing to take.
If my clients had promised not to look at their investment for 15-20 years after they signed the paperwork, I’d have been able to guarantee a much better return. But people do look at their value and if you’re 72 and have just seen your £500k reduce to £290k in six months, you’re not overly happy (even if you are only paying 0.1% for the ETF in comparison to 0.75% on a diversified multi asset balanced fund).
TL;DR - no, it’s not “all about returns” for the vast vast majority. It’s finding everybody’s sweets spot on the risk/return graph. If you’re 35 you can have 100% of your funds in equities, if you’re 65, unless you’re a very experienced/sophisticated investor, that would be a terrible idea and the FCA would find against your adviser should you complain, no matter how much paper work they’d made you sign absolving them of liability.