Not really. I joined Marble's testing server once when he was trying out the bedroom map, 0 lag. Sure, having as many static shapes as you do bricks is unreasonable, but you usually don't need nearly that many for maps (especially when you can use textures).
yeah in small doses w/e it's still gross but it shouldn't be too bad
but fxdtsbricks were literally created to fill in the shortcomings of staticshapes as building tools. if staticshapes become convention, it's going to be about fifty steps backward. it would be much better use of time for someone to make a complete external approach to building with bricks instead