I suppose you're dumb; not because you're functionally illiterate but because it's clear that a laptop is both handheld and portable as much as Steam Deck.
Form factor is completely irrelevant since Steam Deck is advertised as a computer and not a console. Which is how I would use it; plug it into a monitor and use it as a desktop PC with keyboard and mouse. That's why I asked what does it offer that my laptop already doesn't in the context of playing games. If this is hard for you to comprehend then you shouldn't reply with destructive comments. I found a video on YouTube explaining technical specifications and comparing the CPU and GPU to their desktop equivalents, so my initial question has been answered.