Yes I admit it's not easy or user friendly - *but* some companies have actually shipped off-the-shelf routers with these open source operating systems installed (they weren't too popular, not unlike the Dell laptops with factory installed Ubuntu linux).
But in my previous job one of my main duties was to manage a pile of open-source Linux servers and enterprise routers so for me it's second nature
Hell, everything from the Superhub to top-end Cisco and Juniper chassis run some variation of Linux.