Sending a lander to pick up the samples is worth it just for the technical aspect.
Making a successful return trip would be an important milestone, we never did anything close to that before. Yes, moon landings, but the moon is 100-1000 times closer and 10 times less massive than mars, with half its surface gravity.
If it ever happens, the "get back samples" mission is likely to focus on that technical aspect more than anything else, it may not even have a way to explore and collect samples. So let Perseverance do the collection because it is what it is designed for and put them in a neat pile so that the other mission can focus on getting them back.
Further missions should be able to do both collection and return, maybe even take people, but starting small may be a good idea, especially if human lives are at stake.
Making a successful return trip would be an important milestone, we never did anything close to that before. Yes, moon landings, but the moon is 100-1000 times closer and 10 times less massive than mars, with half its surface gravity.
If it ever happens, the "get back samples" mission is likely to focus on that technical aspect more than anything else, it may not even have a way to explore and collect samples. So let Perseverance do the collection because it is what it is designed for and put them in a neat pile so that the other mission can focus on getting them back.
Further missions should be able to do both collection and return, maybe even take people, but starting small may be a good idea, especially if human lives are at stake.