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An argument against that thinking, is "the fewer the better" can be taken to the extreme where humans are put to the brink of extinction.

Another argument, is there is plenty of room for the increase of humanity. Using technology, humans could populate other planets in our solar system and beyond.

Yes, ideally humans go extinct sooner than they would have without AI - ideally through just slowing reproduction to zero and self isolating like the Neanderthal. If the human population reduces to 1-2B over the next century that would be a massive win.

Humans spreading to other planets, beyond it being energetically inefficient, would be a worse outcome for the universe than if we went extinct.

Humans (and all existing life including all mammals) are fundamentally flawed at the core and cannot get to a point of coherence that is worth expanding.