Pound in ice pins in ice are next to worthless/body weight only. Testing reveals they blow out at about 5 kN, or more practically, less than the force that a Screamer or other load limiter limits the load to.
Thy are alright in frozen moss, mud, ice filled piton cracks etc. espcially if they are placed so they cam. Mainly because they are the only pro that will work in such situations.