gillybob watch the programme and you will see, or if you have not the time
The main reason was that as a result of their own dysfunctional childhoods Albert, especially, and Victoria drew up idealised plans for the education of their children that they were convinced would produce a perfect product, essentially mini-mes. Not the self-indulgent modern version, but obedient and compliant children who would think like their parents and obey them.
They did not take into account the possibility that their children would not be the compliant wax shapes they expected but would inherit traits of character from their parents that would be difficult to deal with..Victoria was self willed, self centred and had a volcanic temper. Her eldest son was not academically inclined and was self indulgent traits, he inherited through Victoria's own family.
After Albert's death, she became an adept at emotional blackmail.