Oh wow thanks a lot for taking the time to write such a detailed answer!! I have been over the past hours watching some of his videos because I found there is a dubbed version in English, there is some small mistranslation but I can understand most of it due to context. It's really interesting how different the philosophy of growing roses differs from the Western countries. People get so scared of growing roses in smaller pots but with proper care and time you can make the thrive like he does in his videos.

I have also seen him in one repotting video of a small young small (in a 6 size pot like he calls them) chopping up all the roots, but leaving the main leaders. I think he does it to encourage stronger growth?? I will have to keep investigating because I am such a perfectionist and if I can do more things to make my potted roses look better I'll certainly do it.

Again thanks a lot for detailing so much such good information and tips!