That's kind of a "glass half empty" view of looking at things. Nothing wrong with wanting Superchargers in more locations... and there is more to Texas than Dallas and East Texas. Lots of reasons for needing to route through Lubbock.... For one it would close a giant Supercharger gap in West Texas (Not everyone ends or starts their trip along with I-35 corridor.) and Lubbock can be way more convenient routing for some trips. Right now, I'm visiting family in Levelland (west of Lubbock) and I have seen many Tesla's on the road up here. While not as much as out in East Texas, it's way more then I have ever seen up here before. Lubbock has a large university, fast growing tech sector and they even have an active Tesla Service Center now. Lubbock is the largest city in Texas without a Supercharger right now as far as I can tell. I live in Abilene so any other route that doesn't go thorough Sweetwater/Lubbock would add significant time to the trip.
Also, a direct route from Amarillo (I-40) to Sweetwater (I-20) is out of reach for most Teslas. I know my MYLR at full charge can not make that Sweetwater<--> Amarillo trip in either direction without a stop in between. Say your going to Abilene, or Midland, San Angelo or anywhere else in west/central Texas. Going down US-287 would make no sense and going through Lubbock would be much faster..
None of this really matters anymore though. We know for a fact that a Supercharger is coming to Lubbock and has even been confirmed by Tesla employees at the service center.