Diplomas reflect the school’s requirements

Not awarding high school credit for work done at home may seem unfair at first glance, but think about it from an institutional point of view. If a diploma means the student has taken these specific tests and followed the standardized curriculum, then it might seem that the only fair way to administrate this is to make it apply to all high school students for each year of their work — even if a year or two of that was done at home. The child is no longer getting a homeschool diploma (though by the way, homeschool diplomas work just fine) — but will be getting a public school diploma, which indicates completion of public high school requirements.
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References: https://www.thehomeschoolmom.com/going-homeschooling-public-school/

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