I can't see any reason for someone to take 'ownership' of these profiles. I checked a couple of profile managers and they are still currently active on Wikitree, and as you say, there could be any number of reasons why they haven't updated these profiles.
As you seem to feel strongly that they need to be improved then you should be able to do that yourself. Obviously if the profile is Open then anyone can improve the profile, if they are not Open, then you can ask to be added to the trusted list for those profiles.