Moffet is not a soon to be busy street. Its a two lane road with a one lane bridge. The developer will have to build a completely new bridge over the channel to connect to the new "golf course resort" that's coming to the other side of Jamboree. Tustin legacy is on the back burner for decades.
I give it 10-15 years before any traffic hits this street, and even then, its not nearly as useful of a street as Warner when going to the district. This is the same as paseo westpark, which sees little traffic except during school time which won't affect moffet.
I personally like the homes that back to Moffet for this reason, and I don't want homes towering over me when I stand in my backyard. I'd rather back to Moffet than Jamboree, Harvard or Warner. If you want a private yard, then you need to back to something, whether its a street or a fire danger open space. If you don't want to use your back yard, then an interior space is better.