more likely or less likely has nothing to do with observation indipendece. I flip a weighted coin and it's tails 99% of the time, it's the coin that is weighted it has nothing to do with me. The same thing with the parameters of the universe, the fact that life is present on Earth and not on Mercury (to take an exterme example) is not dependent on the observer being intelligent or even alive. even a non intelligent "aparatus" can detect it. it may not "know" to clasify it as life/not life but it can detect the difference.

Saying that we wouldn't be here to ask the question is not an answer to anything because we are here and we need to understand how and why.