there are over 4,500 HS baseball fields in Japan and the majority are "all dirt" infield.
Koshien Stadium is like a "shrine" for the Japan HS baseball players. Only 50 teams are invited each year to Koshien for the Spring and Summer National tournaments.
New HS Stadiums are built to the specs of Koshien [dirt infield]. When our team played in Kawasaki, it rained for 8 hours and our American players believed the game to be cancelled. I told the players be prepared to play. The Japan students and JV players emerge onto the field with shovels and "huge sponges". 12 holes were dug and the water ran into the holes and removed with the sponge. We played the game. The Japan HS pitcher was clocked at 95 mph.
Fields are "all dirt" in Korea and China.