Or, alternatively, reproduce abundantly and use your children to make alliances with families that actually do matter.
You're advocating having few children in a thread related to Saudi Arabia, a kingdom whose founder had 20+ wives and some 100 children. That is how all the warring clans in the Arabian Peninsula were united and pacified: by marriage.
An inheritance split between 100 children, and then split again between their children a generation later is going to run out pretty quickly.
Even if it's only 4-5 children per person it will run out within a few generations.
Also, why should all children inherit equally? Marry the daughters into wealth, and make sure only capable sons inherit.
In an ideal world, that's a great idea. In reality, see above about camels, Mercedes and Lamborghinis.