Excellent post! I would also like to add that life does not have to be life as we know it. There are multiple definitions of life, even here on earth. If you take viruses for example, they don't always qualify as being alive! (See here for more info). Since things are not clear not even here on earth, we are going to have a hard time defining whether something is alive or not in external environments. Additionally, life does not necessarily need to be based on water, just because we are. It can be based on a completely different chemical compound. For the above reasons I personally find it too vague to specifically search for "life" in other planets. If we do find life, we will more likely find out much later, while examining something different.
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Hey @elemenya, thanks for your great input. The thing is we don't know any life forms other than based on carbon, that's the reason we try to figure out were else in the galaxy life in this form could exist.
I totally agree, that there could be life forms not based on carbon. Who knows how the parameters for a habitable environment would look like for them.
Based on that there is a good chance to oversee life-forms.