Why do German apartments not have closets?

Because we are thinking of moving to Stuttgart, I went to see my first apartment there yesterday. It was 73 square meters in size and advertised as a 3-room apartment. The Germans speak of apartments not like Americans do who say 1 bedroom, or two bedroom. Here, people speak of 2 room or 1 or 3 room apartments. Like in the US the bathroom and kitchen are not included in this designation.

The 3 room apartment which I saw would be a one-two bedroom in the US. There were 3 rooms besides the bathroom and kitchen, a living room, dining room or second bedroom/office and one bedroom. It did not have a closet which I find rather peculiar although this is standard here.

Why do German apartments not have closets? Is it a space issue? Do they think everyone moves in with dressers and portable closets? This is very unlike the US where there are always closets.