I also think it is not overly useful and with its positioning i see risk of accidental commands. However, playing devils advocate here, I can see people having their hands on the mouse and easily access the commands from there, while the keyboard has it on the other side from the WASD keys, which are probably the most common being used (personally i would have put it vertically on the left side instead).
Also it is clearly for gamers, and gamers want cool stuff like RGB (which almost everyone has now) and fancy screens help to stand out now.
Personally, I just want a full size keyboard with multi media keys, no Fn-shite, background light and either cable with usb hub or wireless with a long battery life (wuithout led on ofc). But that seems to much to ask these days.