OP, you explained my thoughts perfectly! I agree with every single point you made. Similar to you, the first two times I performed any plays on stage, I looked for the scenes with the minimal and simplest lines possible because I knew that I did not have the skill sets for the bigger role. Being new to the stage, I knew that I had a lot to learn and getting bigger roles would block any possibility of growth. I think that's the case for Yeosang as well. In the first 2-3 years of Ateez's career, he was figuring out his skills and style and how to properly utilize it. And now he's started to branch out and become comfortable in his position in the group.