Liquid-fueled rockets do have some advantages. OTOH continual readiness is not one of them.
This is a formidable first strike weapon if it can be fueled in its silo without any indications of that operation on the surface. Especially if a large number can be fueled and launched simultaneously.
I have known several Russian chemists and engineers.They approach things differently than we do in the west, but we are in great peril if we assume they are stupid or backward.
But it keeps them busy. And does continual refueling cause wear?