I dont think that combo is easier to do since it requires peak height. Most of the Shang players who've played in tournaments dont do it because it's too hard. The only thing you have to do for [Y]F43 is frame kill a bit at the start. I do a small backdash...
It also does SLIGHTLY less damage than this one.
Young F43 adds a bit more damage than just raw 4 and can be tossed into any situation where you would use 4 DF1 to convert. With higher gravity, it becomes very easy to do. I'm sure I can crack meterless 40% but I think more people should be looking at form changing mid combo more.