There's nothing wrong with not retail trading. In fact, most people shouldn't be doing it.

That's the point.

You think some guy at a bank is trading for you.

In a hedge fund sure

Most people are in simple retirement year funds which have a set algorithm which decides by simply rebalancing to follow an index and appropriately mitigating risk by shifting some assets towards bonds.

There is no one trading on a whimsy. The mutual fund founding documents specify an exact time of day (or times) at which the fund gets rebalanced and it simply follows the algorithm..

The price shocks discussed here will not affect that

You missed the point of that comment. Nobody at your bank is trading for you or themselves at 3am.