Writing and Reading

      To get the new ZIP code system going, large bulk mailers such as magazine distributors and publishers 
were targeted first. As for individual correspondence, acceptance was a bit slower. 16 As usage rose, mail 
using the code was given priority, and that mail was delivered much faster. Despite the fact that not everyone was enthusiastic, the Postal Service hoped that by the second anniversary people would be more comfortable with the system. Ultimately, the full benefits of the system wouldn’t be realized until everyone was using the number.

At this point, the writer is considering adding the following sentence.
Initially many people didn’t even use the new ZIP code, and most personal letters were still delivered in roughly the same time frame.
Should the writer make this addition here?