Transplanting David Austin Shrub Rose from Container to Ground

It is absolutely recommended that we disturb the root ball as little as possible when transplanting. However, in this video you’ll see me removing the original soil from the root ball, distrubing it quiet a bit as a result. I wanted to see how much or how big the roots grew in a single growing season (I planted this rose from bare root). I also wanted to gauge how long the rose can stay in this size container before it becomes root bound. My guess is around 3 years or three growing seasons.
On a side note, my Harlow Carr did go into transplant shock as expected. It spent late fall through winter (Nov-Feb) sleeping and recovering and today (March 11) it has awakened and beginning to leaf out.
Thank you to the viewer who asked me why I removed the original soil since it disturbed the root ball - a very good point indeed. I should’ve explained my reason in the video.
Happy gardening! ☺️