> What is science? natural philosophy!
It was, back a long time ago, but the natural philosophers fell away as more technical knowledge came to be required to advance the field.
> What is mathematics/computer-science? modern philosophy!
Not really, no. It doesn't provide any guidance for life and it doesn't grapple with any of the big questions, even to say they're meaningless. It isn't philosophy as anyone defines the term.
> The holy grail of computer-science is artificial intelligence!
That's the "holy grail" of one sub-field, maybe. Not the whole field by a long shot.