I assume because of conservation of energy and to balance the equation at t=0 and infinity? But it depends your perspective, maybe it's okay if it's uneven like you're saying and black holes act as something like a pressure release valve that balances the overall equation at any particular moment.
Hi I'm a medical doctor, this is just a hobby my uncle got me interested in as a kid. If the universe is acceleration and galaxies are moving further apart, we assume the universe as a whole is expanding as a result. It's also projected to my understanding that eventually the universe will...