I’ve worked with large organisations that have merged dozens of companies networks. There were lots of clashes. I’ve also worked with companies where their net

I’ve worked with large organisations that have merged dozens of companies networks. There were lots of clashes. I’ve also worked with companies where their networks filled up almost all the 10/8 space and they were running out of room. Having to do things like shrink subnets at individual locations and deal with issues around not able to install all the equipment they originally wanted. It’s a real pain. And yes, the entire 10/8 space needed to be routable through to the corporate support desk, SIEM tools, payment systems, loyalty systems, security and other IoT systems, etc. Yes sure you could probably NAT things, or switch to tools/approaches that don’t require every device to have an internally routable IP, but then that’s a terrible argument akin to arguments against IPv6.