The reviewer at the customer's bank reads your reply in about 90 seconds. A structured scoring sheet is open on the screen, and a queue of similar cases waits behind yours. Yours is one of perhaps 50 the reviewer reads that day, and the decision is often made before the second paragraph.
The reviewer scans first for the dispute reason the bank filed under, such as Visa 13.1 or Mastercard 4853-NA. Next come the labels that say what each piece of evidence proves. Then comes the answer to the question on the bank's review form. An opening paragraph of background delays all of that, and the reviewer may never reach the substance. A reply that leads with the reason, labels each exhibit by what it proves and answers the bank's question early makes the same argument readable in the time available.
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With 89 cases left in the queue, the reviewer rewards a reply that is easy to scan.