On my desktop, I need that num pad.
On the go, I loathe my laptop keyboard and mouse, and bring a 60% and a mouse. Easy to fit in the bag for travel if I'm setting up shop somewhere for a few days or more. Also a dock so I can hook it up to the hotel TV or conf room display easily if they are behind the times.
Its just a dock, so no.
It works with most laptops running Linux, but its still just a dock. That gigabit port is just a usb-c/thunderbolt device, it is not a full machine. Same with the video, its just DP alt mode, there is no GPU in there.
If you want a small form factor machine to use a server, look for a used tiny/mini/micro workstation.