I do not want to get into a big discussion of “school of thought”, but over training is over training. And to swim more and not swim better or cross train is a big mistake. There are literally thousands of amateur swimmers with shoulder issues who thought, “I just need to swim more to improve”.
Now, one of the most overlooked aspects of any athletic sport/activity is core activation while performing the activity. This requires learning how to activate the support/stabilizing muscles consciously and then making that activation subconscious. It is a little bit of a process. I would be glad to discuss it with you a bit and guide you a bit if you are interested. Just go to my profile and contact me via Idea Fit.
Or…If you are interested in coming to Kona on the Big Island of Hawaii, I do teach coaching and swim instruction for all levels (age group, masters, high school, college, elite). This goes beyond WSI and most team coaching skills, knowledge, and abilities. You can get in touch with me through my profile.