A lot of people will agree with your post, and a lot of people will disagree. Most of the hardcore DCI and 'seasoned' crowd are against what the marching arts are evolving into. I personally love how programs are advancing and creating new ways to perform.
You are going to see a lot of outside the box productions at BOA competitions. Big props, outrageous guard outfits, pit sound effects, ect. The more UIL minded programs are the ones that are going to put out the more straight forward 'play and march' type shows. It can be quite difficult to design a show that can cater and excel in both. Often times you will see a band finish well at a BOA contest and poorly at a UIL one, all depending on how their show is designed. Recently LD Bell and Marcus have been able to do very well at balancing their shows for both BOA/UIL, winning both UIL State and various BOA contests within the same year. Other programs such as Richland, Haltom, Reagan, Churchill, The Woodlands, ect have also done well at both.
The Arlington regional was earlier again this year and probably the first competition for almost all of these schools. I'd be surprised if any of the finalist bands had their completed shows on the field, which may be why some were harder to understand.
I don't know if this answers any of your questions, but I thought I'd post something. Please forgive any misspellings or syntax errors. Just got home from work and I'm exhausted.