TAB, I acknowledge there are different types of PVC, and you are the "Man" when it comes to different types of PVC.
I think to keep it simple, one has to factor in a very important consideration: "How Long is to be Buried?"
Few Weeks? Few months? Few Years? A Decade? If its short term, and done correctly, Good 'ol PVC works, that's all I'm saying.
Although the big picture answer we "might" both agree on is, if we really have to start burying our guns, it might be time to start using them, because a Revolution will be underway again.
Although, "Some" Californians could have trouble with that type of thing.