Comment by axiolite

> I always thought it would be great to have a "laptop without a motherboard"

That's basically what a rack console is. At 1U it was skinnier than laptops from prior decades. They're not exactly a laptop form factor, but to get them smaller you would have had to accept a much lower screen resolution, which would risk some systems not being able to display (e.g. your server may have booted-up to 1280x1024 while your laptop could only do 800x600), or would have needed to be quite expensive to add an ultra-high DPI screen.

Still, at various times there were briefly devices like that available for purchase at closeout prices... like the failed "Motorola ATRIX lapdock":

https://www.cnet.com/reviews/motorola-laptop-dock-review/

https://www.amazon.com/AT-Laptop-Dock-Motorola-ATRIX/dp/B004...

I'd say the USB-HDMI capture card is a better solution all-around. I even prefer it to USB "crash carts" because you aren't dependent on the manufacturer keeping their proprietary software software updated for each subsequent Windows/Linux/Mac release.