Lean might not be the best choice to describe it. It certainly has much less midbass and midrange presence in favour or allowing a more neutral midband thus allowing the lower bass to emerge and not covered by a more prominent midbass.
On my 12" bass driverss i am actually getting more lower bass weight and impact, but less midbass weight and punch.
That is why i qualify that on a 10" or smaller bass driver, it would possibly cause a overall leaner and lighter bass presentation.
Depending on associated equipment and room acoustics (excluding a boomy room) possibly a fuller midbass presentation may be better suited to a smaller driver. Otherwise, in a boomy sounding room/system, the back may possibly be a good choice, but one would have a long way to go even before trying out the black fuse as a bandaid.