The folks in the hobby, at least the ones that have been around for any length of time know what methods work. Pioneers from the early days that imported these animals (boas) and watched them die due to sickness induced by stress or parasites they brought in from the wild. They eventually came to discover what options worked BEST across the board for their animals.
Plastic caging didn't evolve out of fad or trend. It became the standard because of the multiple bases it covers. Wood is decent, but requires more work to seal, clean and the cages are much heavier.
I have not seen Vincent Russo (THE COMPLETE BOA CONSTRICTOR) or Nick Mutton and Justin Julander (THE COMPLETE CARPET PYTHON) or Gus Rentfro, one of the top boa constrictor authorities in the world talk about grow tents.
If you are looking for affirmation to use a grow tent, you likely won't find it amongst people that have been keeping boas for any period of time.
Use what you want. It's your choice. However, years of trial and error and time tested methods all point to the proven type of caging.
Craiga was just passing on what has been passed down the line by experienced people in the hobby. Specifics are already out there as to why proven caging is used. Research, books, and experiences by multiple keepers and breeders are readily available. This board even has recommendations as to what caging works best in most situations.
Craiga's advice was good. Why waste $200 when you can make a move that will likely last your animal a lifetime right off the bat?
Again, use what you want. Remember boas are complex and there is a difference between surviving and thriving.
It appears you are wanting folks to approve of a grow tent and I just don't see a lot of experienced keepers going that route.
The choice is yours.
Good luck.