Remember, you can't patent an idea, so there can be other manufacturers could build and easy-to-regrease system.
I've got the EZ-Lube (R) system and love it for making sure there is always clean lubricant in place.
Having a zerk fitting does NOT eliminate routine dismantling of the hubs, cleaning, inspecting for wear and replacing worn out components!
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!