The development of block programming is a huge effort. The same App Inventor has been under development for more than 10 years, but I can’t say that this platform has been able to go beyond training and become a platform for creating applications.
For the sake of interest, you can look at React Native, which is based on Thunkable X, but you will quickly see that creating applications on it is significantly more difficult, and there are also enough problems there.
I hope that Thunkable X will work more reliably and better.