With correct exposure/development and lighting conditions, you should not need to split-grade print.
For a straight print i.e. one soft exposure followed by one hard exposure, you're probably right and for some negs this is how I choose to do it. However, varying the ratio of soft/hard exposure in specific areas of the print allows me a degree of control over contrast in a way that a single grade could never do. The point is, split-grade printing is a tool I choose to use. Your point seems to imply, and I apologise if I've got it wrong here, that split-grade is merely a remedy for printing badly exposed negs.
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