Why didn't water baptism cause the Holy Spirit to indwell the disciples at Ephesus in Acts 19?

In Acts 19:1–7, Paul meets some disciples in Ephesus who had received only the baptism of John. After explaining the gospel more fully, he baptizes them in the name of the Lord Jesus. However, it’s only after Paul lays hands on them that the Holy Spirit comes upon them: >“When they heard this, they were baptized in the name of the Lord Jesus. And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied.” (Acts 19:5–6, KJV) Given that in many parts of the New Testament (e.g., Acts 2:38, Romans 8:9), the Holy Spirit is associated with baptism and repentance, why didn’t the Spirit come upon these disciples immediately upon their Christian baptism? What theological reasons might explain this sequence — baptism first, and then the coming of the Spirit only after the laying on of hands?