Please don't take this as being contrarian or arguing, but that is not wholly accurate. Alot of exploration is in sm, but there is a ton happening in bm as well. The difference is the people who like to post and discuss their exploration on the internet are mostly sm divers. Not saying they are posting and discussing it more because they're sm divers. It just happens to be that way.No doubt that for exploration it's all being done in SM these days.
There's alot of work being done in Mx that isn't common knowledge as some of the explorers keep it quiet.