And to hundreds of decimal places, they are just as long as they need to be to reach the ground.
But for specifics, a long sequence of events and conditions produced us. Any other set of conditions would have produced something else, not us.
There is zero factual evidence that the "something else" would have been advanced life of any kind. There is much evidence to suggest that the parameters that produce advanced life are VERY narrow. Why don't the other planets and other bodies in our solar system have life if the parameters for life are not extremely narrow?
You are hypothesizing that diffrent conditions would have produced different kinds of life, but we already have places where that hypothesis has been tested: The other planets and their many satellites (Saturn alone has 22 large satellites, one with an atmosphere closer to Earth's than any other known body).
Someone who is six feet tall has legs of a certain length. No coincidence. He is six feet tall because his legs are that long. We are here because of events
A better analogy to describe the facts scientists are finding would be to say that there was a universe where no one can live who varies more that 1mm from six feet in height. Different legs would not produce a different height, but death. Since our height varies slightly from day to day, no one would survive in such a universe long.
If you will look at the link I have provided, you will see that most or all of the 118 parameters apply to ANY kind of advanced life arising. Any carbon based life as we know it. Big brained dinos, whatever. The odds against ANY advanced life as we know it, not just humans, seems enormous.