The Avangard is quite expensive but it can be a way to both increase the maneuverability of the warhead and its range.
Personally I think the design is a bit more complicated than strictly needed. It also needs too large of a launch vehicle. Right now I think it uses the UR-100. It is either that or the R-36 family because the warhead is just plain huge. I think those missiles should have been put to pasture already however. Just too complicated and niche a capability to be useful. If they miniaturize the concept to fit into Yars then it can make sense I think.
Personally I think the design is a bit more complicated than strictly needed. It also needs too large of a launch vehicle. Right now I think it uses the UR-100. It is either that or the R-36 family because the warhead is just plain huge. I think those missiles should have been put to pasture already however. Just too complicated and niche a capability to be useful. If they miniaturize the concept to fit into Yars then it can make sense I think.