Rear remotes can be quite costly to add, depending on a variety of factors. As L4740 noted, for each cylinder you need a set of remotes. A Front End Loader (FEL) is sort of two remotes, so for my snowblower I control the up/down and chute angle with the FEL control and rotate with an added remote. There is open center and closed center hydraulics, which I have never understood, and my rotate function needed an open-center so it had to be added.
Compact tractors usually, in my experience do not come stock with remotes , probably for cost reasons. AG tractors usually come with two, probably because you can't sell the tractor without them. Typical AG uses for a remote would be to dump a baler, etc..