I wish AutoZone Park could have been used, but I'm not sure the TSSAA or the Redbirds really wanted to use it for prelims, and I know they didn't like how the title games went last year.
All four HS fields used this week ARE in excellent condition -- the only problem with any of them is maybe the fence at Bartlett being a little cozy, but that's not as big a deal for A, IMO...the outfielders aren't as fast in A, and playing someplace like USA would lead to a completely ridiculous amount of triples. Even with AAA outfielders, I think the triple records were all broken.
My guess on CBHS and Briarcrest playing at home is that it was done because they were still responsible for maintaining the fields. I agree, I really don't think they should have put D-II at those two, though I do think they should have been used.
Personally, I would have only used Field 2 at USA for the first session, then played 10-12:45-4-6:45 all on the stadium field on Wednesday and Thursday. But that's just me.