I would call the fine tuning problem an #N/A instead of an illusion. If anyone has dealt with spreadsheets or data analysis, you will be all too familiar with the dreaded #N/A that appears when you fail to have the required inputs for the function. This is the case here. We simply don't have knowledge of how universes come about, how physical constants come about, or how many universes there are. We don't have the inputs for a probability calculation, which is why it should return an #N/A.
IOW, it is not the universe that is fine-tuned, but rather life that is fine-tuned (mainly through evolution once life has gotten started through other natural processes) to fit in the universe.
The Puddle explanation doesn't really address the basic argument. The fine tuning argument deals more with fundamental constants and starting conditions that allowed for stars, galaxies, planets, and complex chemistry to exist. If we were addressing an argument over how the Earth was designed for life, then the puddle analogy would be spot on.
quote:The Mesquite Lake Resource Recovery Project is the world's first cattle manure-fired, commercial scale power plant. The plant has been in commercial operation since late 1987 and Southern California Edison (SCE), the utility that buys our power, formally acknowledged achievement of Firm Capacity October 20, 1988. A cow manure fueled power plant (Journal Article) | OSTI.GOV