Microsoft’s Surface series of laptop-tablet hybrids is now in its ninth generation. And any consumer technology that lasts that long in tends to settle into a comfortable groove. The Surface Pro 9 is so comfortable with its dominant space in Microsoft’s lineup that not only has it gobbled up some of the features of the Arm-powered Surface Pro X, it’s now absorbed it completely into its brand name. Intel or ARM 5G: Pick your processorThat’s right, there’s just one Surface Pro now, and you can have it with either Intel 12th-generation guts or Qualcomm’s custom-made SQ3 chip. The two devices shar…