that has nothing to do with the topic. It is not what we control, but what we plan. In each case there is a vague number envisioned, 2-4 or a football field. The sheikh in this clip prefers the football field. small vs big. you say if there is a football field family would that happen without the will of Allah, that applies to a small family too.
I agree with you more on this now I think a bit more. It seems that wishing for one or two due to materialistic worries and wishing for 20 kids could also be for materialistic desires (as children are also dunya) both are not correct.
We should plan at least for knowing our own capabilties with regards to tarbiya and energy for the number of children. So after refinement I think planning with a view to material constraints/desires is wrong.