This I can confirm personally. I could read fluently before Kindergarden because my older sister taught me so, not by force, but because I asked what the big letters of luminous advertising on a supermarket meant. So it began :) And I learned to learn by reading everything I could get. By myself.

But: that probably won't work for everyone. Furthermore the question remains how to do that when both parents have to work to make ends meet? Maybe even multiple jobs, as it is common for many nowadays? Also one can't overgeneralize this, as there are good teachers and schools, and bad ones. No matter what country or system or schooltype.

As always: it depends...