I'm sure there are good arguments for not having better pictures of Amalthea but they are overshadowed by the journalist's mood.
Amalthea is extremely small , much closer to Jupiter than Io, thus much more exposed to radiation than Io. I remember a number of Io flyby's that had missed a good photo opportunity because Galileo went to a safe mode precisely at the moment it was supposed to take the pictures.
If it happened near Io, it surely would have happened near Amalthea. Especially after so many years of orbiting Jupiter.
Besides, your link shows other inner Moons with details I was unaware of. So, it's great that even these moons show anything!

Raoul