I disagree about efficiency. I remember living in the dorms, where the communal kitchen was present, less than 100 feet from my room, and well-stocked with equipment.

To use it, you have to transport your ingredients there, trust that the pots and pans were cleaned by the previous users, trust that no-one else is using it at the same time, trust that everything is currently functional, do the cooking, and transport the food back, or store your food there and hope no-one steals it.

The dorm kitchen only had 1 set of equipment (1 oven, 1 fridge, etc). Considering that most people in an apartment scenario would be prepping their main meals around the same time (dinner after work), there would have to be many sets of equipment so they could run in parallel. There would be little gain from shared equipment if you still needed ~5 sets for 10 families instead of 10 sets for 10 families. Also, if you have any specialty equipment (ice cream maker, wok, favorite stainless steel pans, any number of things) you either have to lock it up in the communal kitchen, transport it every time you use it, or just use it on-site in home.

The efficiency of a communal kitchen is too predicated on trust and good maintenance by the community or landlording organization. In practice, it limits people to simpler meals with less prep. It will rarely match the efficiency of individual kitchens.