Why I resell my smooth4

A year ago, I bought a smooth4 of ZHIYUN?for 350 dollars from xianyu. At that time, I didn’t think about what I could do better than it in meeting my wants.
When I got it, I couldn’t tell my friend how I felt by word. What I could tell my friend would be to say “now, I get what I want”
Now, after a year, I plan to resell it. I also agree with the point that smooth4 is a good product, but who wants to use a product which is behind the times.
Now, as a stabilizer, SM4 can’t do what others can’t do or do better than others.compare with new products of Stabilizers, smooth4 can’t instead every one of them. On the other hand, as saying”a coin has its two sides”, the new Stabilizer can instead smooth 4
Then, my reasons for reselling it are what smooth4 lacks.
First, smooth4 lacks rocker to control the direction of the lens. That’s the important reason why I resell it. Maybe, when I use it, the rocker of Stabilizers is seldom used, but a stabilizer without rocker is behind the times.
Second, the functions of SM4 have PF, F, GO and POV, but not V.V function makes lens left-handed rotation or right-handed rotation.
Finally, as a stabilizer, it needs to be portable. It means users can put it in a pocket or little backpack to go wherever users want to go. smooth4 is not portable enough to do what I just said.
As a whole, I resell smooth4 because it lacks what I want.