It's good that you didn't notice any drawback. it means this mod worked for you as you wanted.
Here is the reason I don't want that.
After the mod, /system increased from 312.5MB to 400MB (88MB difference) and /data from 380MB to 420MB (40MB increased).
From where the space from? It is from the partition intended for /system/vendor. After modding - /system/vendor mount point disappeared, means its contents is now in /system partition.
As I do not use stock rom, the 133MB partition intended for /system/vendor can be wasted. But thanks to alliance kernel, it is (automatically) mounted and used for dalvik cache (described HERE
). Without it all the dalvik cache would occupy a lot of space in /data.
In MY CASE, the dalvik cache directory is as big as 98MB. By a simple calculation, I just think the mod can increase the data partition in 40MB, but will cause 98MB of dalvik cache to be moved to /data. So I decided that this new partitioning schema is not for me. I need more space in /data rather than /system.