Curious question to all you investment experts. The SPY/VOO guys did not improve since 2015 and even now. Proponents of the SPY/VOO are based on the 2008... whi

Curious question to all you investment experts. The SPY/VOO guys did not improve since 2015 and even now. Proponents of the SPY/VOO are based on the 2008... which has been rising until 2015. So how is investing into index fund ETFs still relevant today? Just earn on dividends?