I'm totally in agreement that the observer effect is not caused by consciousness, but...

What is consciousness to the universe anyway? It's nothing but a system of electrical impulses,

This is a claim unsupported by evidence. I submit to you that just as we can explain the observer effect without invoking consciousness, we can also explain cognition without it. We can't even prove consciousness exists at all! I know I'm conscious because I directly experience it, but I can't prove to another person that I experience anything, nor can I prove to myself that anyone else experiences anything.

I know my consciousness, memory, and brain are intimately connected. I know that what people describe as a loss of consciousness on my part is strongly correlated with gaps in my memory. I know those gaps correspond to time periods when people tell me I'm unresponsive to stimuli. I even know other people become unresponsive in connection to same kinds of things that cause gaps in my memory, and they likewise describe similar experiences to mine when, say, they ingest substances that I've found to alter my behavior, and which feel like they alter the quality of my consciousness.

All of that is to say that we have very good reasons to suppose that consciousness (if it exists) interacts with the world of measurable phenomena all the time, and that other people experience consciousness. But what we can't do is measure the difference between a conscious being and a p-zombie. There's plenty of correlation, but correlation is famously not causation, and we don't have a testable theory that would explain the causal link, or allow us to test whether, say, a cat, a tree, or an LLM is conscious.