I specifically referred to the safety/efficacy of ripping valves apart/off, not conventional venoplasty.
The CCSVI procedure is not conventional venoplasty; in many to most cases, it is valvuloplasty. What you are referring to I believe could be called annuloplasty or tearing of the annulus. Some have said this is not a safe practice because it increases the risk of scarring or damage to the veins.
But since you mentioned the Hubbard fMRI study, do you mean the one where patients were asked to perform the same exercises before and after venoplasty, and surprise, surprise, their scores improved? Of course, correlation does not immediately mean "cause and effect" since of course simple repetition can cause better scores.
As I understand the study, the end measurement was not if scores improved. They looked at what areas of the brain lit up while attempting the task. The task-oriented areas of the brain that lit up were the same pre- and post-venoplasty; in pwMS, this was at 30 - 70% in comparison to task-oriented areas of the brain that lit up in the healthy controls. What changed was that, pre-venoplasty, non-task oriented areas of the brain were lit up in pwMS and not in regular controls. Post-venoplasty, non-task-oriented areas of the brain did not light up in pwMS.
I am interpreting this as an improvement in our ability to focus our brains on a task but I do not know if this is the right interpretation. Exciting research, to be sure. I hope they conduct further tests and, yes, they could test the healthy controls a second time to make sure there isn't a change in their non-task-oriented areas as well (although what change that would be, I don't know, since they already aren't lit up....on second thought, it would be to test MS patients twice without having a venoplasty in between tests, to see if there were any improvements in the lighting up of non-task-oriented areas from the learning effect. )