Right, unplugging is unplugging. So if unplugging the cord from the back of the device is easier, and doesn’t involve “crawling around”, you can do that instead.
My router does have a on/off switch. It’s right next to the power socket in the back of the router. It’s a little easier to use, but no easier to reach.
plugging into AC receptacle is a smooth operation.
plugging into a DC coaxial socket is sloppy. the plug might make and break contact a couple of times during insertion, like turning it on and off rapidly. also it can weaken the contacts of the socket.
all this depends on the quality of the equipment. i’ve seen some very rugged DC coaxial sockets that wouldn’t be bothered by a lifetime of unplugging. i’ve also seen poor quality DC coaxial sockets that after a few dozen unplugging start to not grip as tightly.
so some items will be bothered by unplugging from the rear and others not.