Comment by Panzer04

As in, current indexes perform that much worse. Frontrunners around index rebalancing etc. SpaceX is the same idea, just way more obvious. People knows what the index funds are going to do, and so they exploit that.

The alternative funds are a little pricier, but not so much so as to negate the inherent performance advantage. Typical cost ratio is 0.1-0.5% depending on the niche (wide indexes are cheaper, more niche things like small cap value cost more)