The more time spent on Zemiros, the less time there is for divrei Torah and shmuzzing about the coffee room..
It is a balancing act.
For everything there is a time, as Shlomo Hamelech said.
A time to eat and a time to sing. A time for divrei Torah and a time for shmoozing. A time between gefilte fish and soup, and a time between soup and the main. A time before dessert and a time after dessert. A time for family and a time for spouse. A time for guests and a time to say goodbye.