no cement, that's true.
also, what about sharp objects? bits of glass or whatever?
and what about injuries that could specifically happen BECAUSE you're barefoot, like toes and nails?
we're talking about rough cement courts.
i don't have clay courts to play on.
besides, i won't go playing barefoot in winter so that's a few months with no tennis.
all this is enough while comparing getting injured BECAUSE of shoes, once in a few years.