I would say that assessment is a problem because "sandbox" is a newfangled term for what formerly was called a "campaign" -- and was explicitly the end to which the D&D books were intended as a means.I would say that's more characteristic of a "sandbox" game rather than an "old school" game - old school games are not necessarily sandboxes, and vice-versa.
It is absolutely essential to the game concept that players have plenty of freedom in choosing their courses through the environment. It is a game of strategy, regardless of the scope.
The practical necessities of convention games, and especially of tournaments, dictate some limitations (usually including pregenerated characters). Implementation in the game design of the assumption that such hobbling is going to be the rule rather than the exception is in itself a "new school" characteristic, however one might characterize other features.
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