Why do people think Carbon based life is the only thing that can indicate life?

We are only a small spec in the universe, and we think that something needs to have a stomp sphere rich in nitrogen, etc. and carbon based life. I simply think there are MANY more elements and element combinations that may support other types of life in the universe, and that we haven’t even scratched the surface. What are your thoughts? I’ve thought like this my entire life but after reading the some Andy Weir he seems to think similarly, wonder if anyone else does or refutes this