You just delegated the choice of winners and losers in your economy to an elite cadre of individuals, completely disconnected from boots on the ground life problems.

Symptoms of your decision may include:

Tendency to centralize.

Preferrntial treatment of large incumbents for ease of implementing regulations.

Higher barriers to entry over time.

Decreased feedback loop with regards to reigning in egregious business malbehavior.

Index investing does nothing but perpetuate a small handful of winners, and divests the majority of people from their most important role of being capital allocators.

Part of it, is being bad at it at some point. That's how you get better and increase overall world awareness.