It is sad to hear of another MHD lost due to neglect. I know where you all are coming from. I do agree that the MHD is more fragile than the uromastyx. On the other hand, I think the uromastix is a lot more work to care for. 
The MHD is more fragile if conditions are not correct and is less hardy if illness is not tended to promptly. But, the MHD eats insects that you toss at it, well not at it 
I did have a pair of malis for a while and although I loved them dearly it was really time consuming to make their salads every day. And then, I had to clean the darned stuff out of the substrate later in the day after they had trampled and tossed it! Fool things are such characters, I often found them wearing their greens!
If this kid couldn't get vet care to save his MHD and didn't keep it's cage correctly he likely would forget to feed a uromastyx and can you imagine the results if he didn't clean the cage and the veggies were left to rot? 
I think this is a kid who needs to learn a lot more before he tackles anything other than a traditional pet. With education perhaps he could still be a good herper in time.
Just my opinion!
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Marcia - FroggieB Dragons
www.froggieb.com/MHDHome.html