(public | private | home) data center == centralization
Besides that all nodes behind the same /24 subnet of public IPs will be treated as a one node for uploads and downloads. So, more nodes in datacenter - less data across them.
The same will happen with your home datacenter.
We want to have a lot of nodes across the globe, not in a few datacenteres. We should provide high resiliency and durability for the customers’ data.
I hope you understand the point.