Eccl. 12:7 says the dust shall return to the earth as it were, and the spirit will return to God who gave it.
The body is all that's reproduced. Zechariah 12:1 also says God places the spirit of man within him
Our body is likened to a tent by 3 of the apostles, and Paul says we are naked without the body.
Traducianism seems to have been developed by Tertullian, who was trying to make sense of Romans 5:12 misapplied
From what I have been able to tell, the church mishandled the Gnostic debate and went almost completely silent on the distinction between spirit and body.
This seems to have impacted the church's view of sin and righteousness with very drastic consequences
It also began a long string of extra-biblical doctrines about Christ which end up portraying Him as NOT partaking in the same flesh and blood, and NOT being made like His brethren in all things (Heb 2:14-17)