yeah but think of how many things have to align to enable complex life:

- proximity to stars

- low variability in star's activity (it took life about 4 billion years to evolve to complex organisms)

- The age of the universe as we know it currently is 13.8 billion, and it took 4 of those billion years to evolve life here.

- climate stabilized by our relatively large moon, prevent tidal locking (just the right size)

- Earth being just the right size with the right gravity amount to retain sufficient atmosphere

- an active magnetosphere to protect us from getting our atmosphere stripped, timed correctly to the formation of the planet during active star stage (early development)

- Sufficient rotation rate

- Active plate tectonics - not common as far as we know

probably another 10-20 factors I can't even think of.. something as stupid as Jupiter existing where it does.

It takes a long and uninterrupted time frame for complex life to evolve as far as we understand now. When you look at the probability of complex life evolving - it looks like it's extremely rare.