There's no such thing as a "meaningless" tautology. The meaning is identifying a concept.

For this topic, the purpose of identifying the tautology is because some people do say it's untrue. To them I say, if existence doesn't exist, what does?

A=A

I think. Therefore, you are.

Everyone here is right.

It's necessary to acknowledge that existence exists because without that abstract, one can't form a single concrete, and then how can you live at all?

How could existence not exists? I just don't really understand how it could be otherwise...