Does a flasher make you a better fisherman? Nope, there is more to being a better fisherman than just catching fish!
Does a flasher/camera help a good fisherman put more fish in front of the camera? Most certainly
Even if you know the spots through out the year, watching reactions on a flasher/camera dictates presentation and offerings. A fisherman that knows he is sitting on fish and can see what part of the water column the fish are using makes for a great advantage over the blind!
Just in my opinion, the flasher is more versatile than a camera. If on the move all you need to do with the flasher is drop the transducer in the hole. A camera requires more set time and that does not make for easy hole hopping.
If set up in a shack without planning on moving, the camera makes for a lot of fun to watch while checking out the quarries reactions.