also "constraints" on DM values can be misleading. When you say "a DM particle cannot be more clumpy than X" given an average density of DM particles in the un

also "constraints" on DM values can be misleading. When you say "a DM particle cannot be more clumpy than X" given an average density of DM particles in the universe, you are saying "we must LOOSEN a constraint on the types of things that DM can explain", because for that particular parameter, there is an inverse relationship between constraint tightness and explanatory power.