As we all know, Namikaze Minato and Uzumaki Kushina both died in the fighting of Kyubi no Youko's escape. After the Kyubi no Youko incident broke out, it had a very serious impact on local residents. Without Kyubi no Youko, I believe Naruto's childhood would be very happy, his parents would stay with him, and the whole village would not regard themselves as monsters. Although Namikaze Minato did this out of Naruto's consideration, it was more for the life of Konoha villagers.
Kyubi no Youko is very strong. Although bijuu has ten heads, Kyubi no Youko is far stronger than the other eight bijuu. If Kyubi no Youko's power is not evenly distributed to himself, but all on his son, then it is likely that Kyubi no Youko will break through his seal because of the excessive concentration of power, leading to the destruction of Naruto Uzumaki's will. Because Kyubi no Youko's power is very strong, and it can be hidden in people's hearts, which has a certain shaking effect on people's will, Namikaze Minato also took this into account, thus weakening Kyubi no Youko's power and sealing half of Kyubi no Youko into the body of Naruto Usagi.
In the whole animation, there is a very powerful organization called Xiao Organization, which looks for the whole, wants to gather all the forces, turns the whole into ten tail, and finally inspires the infinite. It is with this in mind that Bo Feng Shui kept half of his mantissa power sealed in Naruto Uzumaki, thus preventing evil organizations from uniting all the forces of bijuu.