It represents a 180-degree turnaround of everything that means receiving/accepting succession.
Previously, to inherit you had to express your intention and take certain actions, for example, filing a declaration with a notary or entering into possession.
Moreover, these actions had to be carried out no later than 6 months after the opening of the succession, otherwise the person was deprived of the right to inherit, for which there were legal proceedings to reinstate the missed deadlines.