If you don’t have all the hooks done up on your bra you are going to put too much pressure on the hooks that are done up.
If you are using 1/2 hooks you are essentially adding 100% extra load to that one hook.
Or if you only use 2/3 hooks you are essentially adding 50% extra load to that one hook.
Any if you accidentally only do up 3/4 hooks you are essentially adding 33% extra load to that one hook.
It only takes one episode of this hook abuse 😉 to cause a lifetime of damage to those hooks. They will almost definitely straighten or twist, if this happens.