All believers have been baptized in the Holy Spirit. 1 Cor 12:13 says so:
1 Cor 12:13 "For by one Spirit we were all baptized into one body, whether Jews or Greeks, whether slaves or free, and we were all made to drink of one Spirit."
If anyone is not baptized in the Spirit they are not part of the body of Christ.
Acts 8 was a unique event in Church history. It was the first time outside of Judaism that anyone had become Christians and the Spirit was withheld until the apostles arrived so that they could witness that the hated Samaritans were not second-class citizens but full members of the church. We cannot make a single unique event in history the defacto pattern for today. It would contradict many other scripture which make it clear that everyone receives the Holy Spirit at conversion:
Rom 8:9 "And if anyone does not have the Spirit of Christ, they do not belong to Christ."
Gal 3:2 "Did you receive the Spirit by the works of the law, or by believing what you heard?"
Acts 2:38 "Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit."
Eph 1:13 "In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit"
etc