No, it isn't.
They created the game they wanted to create, and the ESRB gave them a T rating. It's not like they were given restrictions.
"You guys can only create a T-rated game."
"Awh, man. I wanted to utilize the M-rating."
No, that's not how it works. The T-rating doesn't restrict anything.
English
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T is a guideline in itself, thus it restricts content. May also have been the cause of the demise of TigerMan
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No, it's not. Developers don't "aim" for a rating. They create the game they want to, and the ESRB [i]gives[/i] them rating. It's not like the ESRB says "you have to create a T game or we're going to give you an M rating."