Doesn't using the Deeps mechanic actively counter the Age of Reckoning grudge system ?

So the deeps mechanics is meant for playing tall and not overexpanding, whilst the Age of reckoning needs you to be super aggressive which makes the two mechanics counter each other.

Am i getting this wrong ? Wouldn't it be more reasonable to have the slayer lords be the aggressive ones whilst the other dwarf lords are all about digging deep within your halls ?