Blizzard's map maker's ego is ridiculous.
So they adopted some good GSL maps like Daybreak for the ladder. However, they had to remove the creep tumors blocking the island bases and put their stupid rocks there instead, despite the creep looking more interesting and requiring detection to clear to make it more difficult to take these bases. They just love their stupid rocks. Also, the middle bases that had 6 minerals and 1 gas got changed to the Blizzard standard 8 minerals and 2 gas, making them dramatically more valuable. They seem unwilling to break with the conventions they set for maps during the alpha testing phase.
So they adopted some good GSL maps like Daybreak for the ladder. However, they had to remove the creep tumors blocking the island bases and put their stupid rocks there instead, despite the creep looking more interesting and requiring detection to clear to make it more difficult to take these bases. They just love their stupid rocks. Also, the middle bases that had 6 minerals and 1 gas got changed to the Blizzard standard 8 minerals and 2 gas, making them dramatically more valuable. They seem unwilling to break with the conventions they set for maps during the alpha testing phase.