Scientifically speaking, our own planet tells us that life is extremely unlikely even on a planet of ideal conditions.
Our earth is such a planet. If life came about “easily” then it would have originated in multiple places. But that’s not what happened. Every living thing on earth - every mammal and insect and flower and fish and bird and fungus and bacteria - EVERY living organism can be traced back to a single one-celled organism called the
Last Universal Common Ancestor (LUCA). Had that one cell not survived to reproduce then the earth would very likely be sterile of all life today, even though the conditions of our planet are ideal for life.
Darwin discovered this using reason long before genetics absolutely confirmed it using mathematics.
If different species traced back to many different last common ancestors then it would indicate that life will readily arise under ideal circumstances. The fact that every living thing has a common ancestor indicates that life does not readily arise.