With @Absotively’s ‘cannot install’ caveat, rather than the ‘cannot advance’ caveat, which i think would discourage advancing ice except when using the ID’s ability, i think this is probably the best route to go down. However, i think it might tend to lead to a style of play in which only 2 or 3 advancable ice are advanced to extremely high strength levels relatively quickly, which i personally think i would not prefer, and which might also make it nigh on impossible for the Runner to get through. This is why i went for something that i think would encourage using a multitude of advancable ice. Still, in my Hack i seriously curtailed Datasucker’s power against high strength ice, so it might not be so much of a problem without that curtailment, and of course it might be preferred in any case.