agree! It depends on the 工人!
My ex-bun bun is just like your 工人..... she always eating and eating (everything)...... And she say during eating, it is her rest (meal) time and she won't take care of the kids.
Therefore, I fly her.
The yan yan now I employ is OK. She feed my daughter for fruit 2 times every day. And each time, she will eat those the bb can't finish. e.g. my bb eat 1/3 orange and she will eat the other 2/3. Ofcourse, I allowed her to eat all the food my bb can't finish for not waste any food.