Fortunately for us we can see them.

Gravity waves are much harder to observe.

You can also argue that we can see them because they are stronger and are evolutionary important.

Well, I'd call the inner ear an evolutionary response to gravity...

Not unexpected; electromagnetism is 40 orders of magnitude stronger than gravity!

It makes sense that the easiest to implement would also be the easiest to learn. It's more shocking just how much harder every other option is.

What other options are there apart from mentioned gravity? I mean there are waves in materials like sound but that seem to be easier than EM.

Neutrinos, perhaps.

Ah, right, that's indeed high on the difficulty chart.

it doesn't seem surprising to me. people were in the lab playing with DC and AC and clearly heard "clicks" from remote instruments that correlated with them turning switches on and off.