Because what you've described isn't a laptop but a shitty desktop computer. Laptops that large are heavy, which sucks to travel with. Such a monstrosity isn't convenient to throw into your bag and bring with you everywhere all day. If you're not even using it for graphics, get a desktop, install Tailscale, and remote in for your shitposts.

Is the opinion, anyway. Nothing wrong with your opinion (or mine), they're just opinions after all, but if I was on my feet all day in the field and needed a laptop, I'd rather something small and light with a long battery life. If I wanted something luggable, I'd go for a usb-c monitor and as small a desktop chassis as would fit a proper GPU inside of a mobile one. But dealing with the cables for that would get old real quick, so a laptop like you describe would be my pick in those circumstances. Eg my friend's a VJ and performs at random clubs and a gaming laptop like you described is the most appropriate device.