Really a magazine printing something there readers would like to have but likely will never have is not unusual, and certainly not restricted to MR or even model railroads in general.
My problem with what MR features isn't the size of the layouts, but rather that almost all their plans assume that you will have a train room, and that the only thing this room will be used for is your layout and as such there will be no more creature comforts than room for two men to stand back to back. However, I was pleased to see that this year's MRP featured a number of designs which took other uses of the space into account.