If one doesn't think his techniques are effective them don't use them. If one prefers a grappling art to a stand up art then by all means do BJJ. I have seen plenty of martial artists practice techniques that for me probably would not have worked well. It doesn't mean however they won't work for someone else in certain circumstances. I guess a lot depends on the person. It is not a reason however to criticize someone for trying to advance their art. I don't criticize them just as I don't criticize others that practice an older more tradional system.