All these solutions increase the weight of the probe but a lot, thus they would have to do away with science instruments. That is why they don't add these items.
Easiest would actually be do away with solar and have RTG's on every probe... But those are expensive and harder to come by these days, as not much plutonium is made anymore.
Bdr1983 t1_iriyiia wrote
Reply to comment by PintsizeWarrior in Continent-Size Dust Storm on Mars Threatens to Shorten NASA InSight Lander's Last Days by Sariel007
All these solutions increase the weight of the probe but a lot, thus they would have to do away with science instruments. That is why they don't add these items. Easiest would actually be do away with solar and have RTG's on every probe... But those are expensive and harder to come by these days, as not much plutonium is made anymore.