Also consider that we have more land area to cover with our schools than any other state - most of Alaska is unpopulated. We have six major metro areas (Houston, Austin, San Antonio, Dallas/Ft Worth, El Paso, Brownsville) and several more minor metro areas (Waco, Corpus, Midland-Odessa, Lubbock, Abilene) all with multiple large and medium high schools in them. Unless we literally cut the state up, those schools will always wind up having to compete against each other. I don't know of another state that has similar numbers of major metro areas - California comes closest with LA, San Diego, San Jose, San Francisco/Oakland, and Sacramento - but even there, it's half the distance traveled. The largest distance between metros in CA (San Diego to Sacramento) is 510 miles, about the distance from Brownsville to Dallas (530 miles).
That being said, I really think it's excessive that every single district puts 4 teams in the playoffs. There are multiple teams that make the playoffs annually at 2-8, 1-9, and 0-10 on the season, but because they're in four team districts, they get the privilege of spending thousands of dollars to bus their kids to a neutral site game to get beat by 70 points by the undefeated cross-district champion.