I agree with this assumption. I am by no means an Astrobiologist or anything like that. All things space related have simply been a lifelong hobby of mine. But I too feel it is extremely, for lack of better words, "arrogant" of us humans to believe that what WE need for survival is universal throughout the cosmos. Or even what other species on our planet need. I am not trying to discredit those professionals in this field who may believe otherwise, but in my opinion once we strip everything down to the basics the reality is that we only have a sample size of 1, which is our own planet. We obviously look for planets that look like ours because we only know of one planet that can sustain life definitively which is our own. But to think that a planet like our own, or even conditions similar to conditions here on Earth are REQUIRED to sustain life is just the modern version of human centric ideology to me. Plus even if we stick to our own requirements for life the Universe is absolutely full of those components as you said. I know that as humans capable of cognitive thought we like to believe ourselves special in some way, but once one understands the sheer SIZE of the cosmos and all that it entails I find it virtually impossible that our little random planet is the only one in the entire Universe with life on it.