Prior to the Better Together update, Minecraft PE commands were able to handle large chunks.
I could replace or fill blocks in a 100x100x100 area with no problem.
Now, with this current version, I am being given an error message that says that the number of blocks exceeds 32769.
I understand that other versions had this restriction going back several years, but why the change to PE?
If it lags, it lags. No reason to prohibit players from doing something just to keep them from the possibility of lag.
It's really quite silly, if I want to change an area that is 100 blocks by 100 blocks, I have to limit myself to changing only 3 blocks at a time, height-wise.

Also, my version is 1.2.0 and doesn't list a .31 or .81 So I don't know if that makes a difference.