This. Plus, who says those ETs are of biological form anyway? Even we are thinking about AI doing most of the work, transhumanism and uploading our minds to machines, and finally, integrating with technology. Why think that a 10 million year old civilization still has flesh bodies, needs, and curiosities?

Another comment also mentioned that ETs don't necessarily share the same interests and thought process as we do, and I agree. For an insanely sophisticated civilization, mental representations and the abstract concepts they can think about are just unimaginable for us.

This. The assumption that these ETs would appear in the same form as us, or even in the same dimension, shows us how limited our thinking is.

If a lifeform has gone through let's say million times the evolving that we have, wouldn't their consciousness and expression of life have developed probably into something alltogether different.

Maybe even something that we cannot see or hear with just our physical senses or instruments. There are many theories about this if you read on the subject, people being in contact with different species, but explaining that they came from between dimensions from example.