I have a Samsung Neo G9, which for some reason only came with 1 DP and 2 HDMIs. For gaming I use the DP, but for work I use the HDMIs. To get the full resolution (5120x1440) I run 2x HDMIs @ 2560x1440 via a DL-6950 dual HDMI solution from Plugable.

The problem is it's one screen. So without this feature, dragging windows hits an invisible "wall" in the center of the screen, my start menu is offset or duplicated, and I can't maximize windows across the entire screen.

With the Intel graphics center and the Intel GPU, I can combine the displays so it looks like 1 screen to Windows. That means I can maximize across the entire display and have my Start menu in the center where it belongs on an ultrawide. That feature doesn't exist for DisplayLink from what I can tell, but it would make a big difference in my productivity. I'd keep using the Intel adapter but it's wonky and sometimes takes 5-10m to actually display on the screen.