BB - That is a good example of what happens when you prune off the top of the stem. Typically, you simply get new growth just below the cut and it does become an extension of the original stem.
Notching is tricky. You have to make the notch about a quarter of the way into the stem. If you cut too deeply, the stem will weaken and may fall off. If it is not deep enough, it will not trigger new growth at that point. And it doesn't always work even if you do it correctly.
Tarev - I think your environment is very different than BB's. As I'm sure you know, light is the key factor in the growth of any plant. Yours appears to have a lot of sunlight so it has grown rapidly and needed a larger pot. In reduced light indoors, plants grow much more slowly and that includes their root systems. Specific environments make a huge difference in caring for the same plant species.
