The assumption that life needs or even prefers earth like planets is about as arrogant as this
Agreed, we have already seen microbial life living in the depths of the earth, organisms living on volcanic lava, and in super freezing temperatures.
Most of the life on Earth needs an Earth-like planet to live outside of Earth, life itself does not.
Life does live in extreme conditions, and there's probably life on planets that we'd never imagine that life could exist on, but...
This isn't about finding life on an exoplanet, because we can't. We're not going to any planets outside of our solar system for quite a long time. Many astronomers and exobiologists believe that life exists anywhere and everywhere it can, and we know without a doubt that it thrives in Earth-like conditions. To many, finding an Earth-like planet is equivalent to finding life. And, for at least most of us, that's probably the best we're ever going to get.
It's been proven in many ways that life almost certainly exists outside of the solar system, and an earth-like planet is basically the last missing clue until/if we find life elsewhere in our solar system, until/if we can go to another star, or until/if we're visited by aliens or intercept their communications from hundreds or thousands of years ago. Anyway you look at it, earth-like planets are bound to exist and we're bound to find them, everything else is a huge maybe.