I don't think it is a boring setup if done correctly.
Some routines, like L4 especially, take a while. In August or so they will start to learn some parts some days, and then by October they can usually put together a full routine, and they get better and better in time for meets in December. Some kids have never learned a floor routine before or just take a long time to get choreography in their brain. It doesn't mean we do routines every day in summer, it is just part of the things they are working on. Still lots of up training and cross tumbling and fun.
As for the OP, as others have said, we split the girls into "training groups" for the summer. You may be in the L3 training group but still move up to Level 4 in the fall. Is that what's going on?