I buy my SRF briskets through Sysco, so they are not frozen when they are delivered to my office. I take them home and put them in my standard sears bought deep freeze. No commercial flash freeze unit for me. I'll pull a brisket out of the freezer on the Sunday before a comp and put it fat cap up in my bbq fridge to let it slowly thaw. I've done this routine for a while now and have had great success. Why do I do it this way? I don't know, cause I've always done it that way I guess, and I'm a bbq guy and hate to change anything that has worked......
I think that sometimes we as perfectionists tend to over think these things. Its all about cooking the meat until its done, and having a great flavor profile. Earlier this year I was traveling for business and just never got around to pulling a brisket out of the freezer. I pulled it out on a Thursday, left it out on my counter overnight to thaw, trimmed it Friday, and got a perfect 180 in brisket that weekend. As with anything that you are "in to", people have a tendency to spend a lot of time thinking about things that in the end may not matter. It's fun to talk about though...