Why is there prebaptismal justification in Acts 10?

An explanation often put forward for why Cornelius and those with him were justified prior to baptism in Acts 10:43-48 is that the prebaptismal reception of the Holy Spirit was offered as proof of God's acceptance of Gentiles. But that acceptance had already been revealed to Cornelius by an angel and to Peter in his vision. And a reception of the Spirit at the time of baptism would also have been proof of the acceptance of Gentiles. Changing the timing of the reception of the Spirit wasn't needed. The best explanation for the prebaptismal timing of the reception of the Spirit is that that's the normal scenario. Its normativity is further evidenced by how Cornelius and those with him are cited as being justified in the same way as others in Acts 11:17-18 and 15:7-11.