Redistribution would take place because of the limited budget?
Suppose we had a network.
Several routers are there.
Some of them are efficient, but the others are not.
The former one can speak OSPF, the latter cannot.
What is worse, we have a poor budget.
There is no leeway to purchase a new efficient router.
In this case, no matter how we would like to unify its routing protocol as OSPF,
we have no choice but to utilize the redistribution.
Therefore, the redistribution is son of necessity.
Or should I say;
if the budget limit was sky, the concept of redistribution would vanish away.