Am I the only person who think that communication experience is cluttered?

This is definitely something to aim for. Unlikely to happen soon, however...

I would like to see the opposite: "share by email" from Gallery should start the Email app, not try to do it from within itself. There is a good reason for having specific tools for specific jobs.

I like your idea in theory, but the consolidated messaging app would likely be a cluttered mess in practice. Shoving emails, call history and n types of instant messages into single inbox for each contact wouldn't be nearly enough. It would need to be amazingly good at managing all of that to be an acceptable switch from familiar one app per communication method.

Wild guess why the gallery app can send email on its own: There wasn't / isn't a way to invoke the mail app so that it opens to a state where its ready to send new mail with an attachment.

If such Contacts app would mean that I could not start a call in the middle of writing a message to somebody else, then no thanks.

Even current implementation does not allow writing a message and reading a second incoming one (without losing the first one).

@Manatus, it does if you added the recipient. You can have one draft per person.