I don't think that the vast majority of the potential customers for amps are looking for the very best and most expensive, just what fits their budget and get the job done cleanly and without any noise. In that order.
And if the amp can fit in the same space as the factory amp or out of the way in the trunk then much better.
IMO, although the XD is the replacement of the G Series, what JL Audio have done with the radical reduction in footprint is to try to get some market from the PDX in price. Although in paper the HD line was supposed to be that PDX competitor the market kept the HD at almost doble the price of a comparable HD. And I don't think that anybody will be confused between what an XD can do and an HD when they are several hundred dollars apart in price.
I don't see anything wrong with this new approach and in this new amp...