I couldn't disagree more. But I suppose, it depends on your market area. In some areas I appraise, a few blocks away makes all the difference in the world to the median sales prices. Whereas other areas, 2 miles away doesn't make any difference at all.
When reading threads about rural appraisals from you rural guys, 10, 15, 30 miles (or more?) appears to be no big deal.
For me, when going outside the subject property's neighborhood boundaries and expanding the search parameters by "miles" (due to the lack of more recent and similar sales to that of the subject), explanation to the reader of the report provides clarity and reasoning if location adjustments are warranted.
This is the especially the case for the OP in the client's 1 mile distance assignment condition requirement. There's no way you can not mention it.