The case for the voter repeal is quite easy to argue: just show examples of maps like Tim drew, and the map the legislature drew.
In theory it should be quite easy to argue anywhere, and yet every cycle these remap proposals come out and it seems like every cycle they all fail. Not to mention that, while it is effective at splitting the state up into reliably Democratic slices, the Maryland map does not actually look all that horrible on paper. Thats doubly true when compared to some other maps, including a particularly notorious one just north of it...