Yeah, by newer I mean since about 1990 when they started making tractors out of plastic instead of steel.
One thing good about the "newer" battery locations is that someone would have to be very determined to steal your batteries.
On my big JD a thief (or me replacing batteries) has to remove 1500 lbs of front end weights first, then start unbolting stuff.
I don't have the need to jump with or to my tractors that often to warrant a permanent jumper setup, the starter motor works just fine.