It was simply so they could fit the new stripes and Sandman logo, same reason Sanmdan was base model only in HX/Z. The HX/HZ Sandman was no longer a "GTS commercial" like HQ-HJ, it was aiming at a different market. They did stuff it up a bit in HX as there was a big backlash on the stripes, they didn't go down to well with customisers, tradesmen and the press. This is why a delete stripe option was made available in HZ, and I'd guesstimate that DL7 was the single most common stripe option in HZ - in total there'd be probably at least 75% of Sandmans got stripes but DL7 would go close to being the most common stripe option.
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