But they record in the proper order. Not all shows air by their actual episode ID. They air in the order the makers want them aired in. Sometimes if watched by episode ID they make no sense.
It airs in the order the channel wants to air them in. Big difference. It can make less sense to watch them in air order.
Plus, many channels air repeats and with premium channels there's sometimes an east and west feed with different airtimes.
A perfect example is when I recorded the Showtime series about climate change. I had started recording the episodes after the show had first started airing so I was collecting the episodes from both east and west channels and in groups where they would air several "catchup" episodes all in a row. Without any season or episode numbers I had no idea what order to watch them in without using a third party website and matching up the episode titles, at least it had those!
There's no rational reason for purposely leaving that info out of the guide data unless it's money, or they can't figure out how to do it or the hardware is not capable of it. I'm leaning toward it simply being that DIRECTV doesn't want to pay extra for the guide data package that includes that info from TMS or who ever it is they use.
Besides, didn't someone mention earlier that the info is available when using a mobile device for playback? If it's there why can't it be on DIRECTV's 'cat's meow super duper" advanced(????) DVR?