Beyond the practical advantages in our context you mention, though, in some cultures it’s just traditional to do the main celebrations on Christmas Eve.
EDIT: I’ve found multiple mentions that in Italy it’s tradition in some families to open gifts on Christmas Eve. There is also a tradition of a 7-course fish meal on Christmas Eve.
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Beyond the practical advantages in our context you mention, though, in some cultures it’s just traditional to do the main celebrations on Christmas Eve.
I know it’s largely the case in Scandinavian countries (see here: https://scandinaviafacts.com/norway-sweden-denmark-celebrate-christmas-24th/) and I suspect other parts of continental Europe.
EDIT: I’ve found multiple mentions that in Italy it’s tradition in some families to open gifts on Christmas Eve. There is also a tradition of a 7-course fish meal on Christmas Eve.