It seems that the high hit points of the worker elephants combined with the short train time is problematic. The cost is also not prohibitive and the worker elephants cost no supply.
In fights, lots of worker elephants can be spammed and sent to join, causing really inefficient trades for the opponent with a high micro requirement. I hope that devs consider changing this before official launch of the DLC.
Yes that was the first thing came to my mind when i saw this but i was too lazy to write it but now it will effect me when i play so i will tell the solution for this devs take note.
First of all they need to have very little colision so units need to pass them easily.
Second soldiers shouldnt attack them when they can attack normal units like they dont attack building but units.
There is a lots of thing about this dlc to write maybe i write them too.