I had this view a few months ago but I currently see it the opposite way around. There are many features in the LBT plugin that are not in Legacy and I feel the LBT plugin has surpassed Legacy for the majority of my personal workflows. But it all comes down to which features you really need access to. I would say the energy simulation capabilities of the LBT plugin have now exceeded the Legacy plugin but we probably won’t have as many of the Radiance simulation features of Legacy in the LBT plugin until the next stable release in another month or so.
See the release notes for more of the new features that the LBT plugin has over legacy: