Not only is there some additional network logic to help handoffs go smoothly, there's a lot more complicated business logic going on with cellular APs than home WiFi APs. On top of that, you're going to want to try and control potentially thousands of APs and have them orchestrate and you may not want to rely on RF links to propagate changes.
A home WiFi AP is doing a pretty straightforward relation of SSID to some Ethernet-like network. Anything talking on the Ethernet network addressing a client goes out the radio, things coming from the client to the Ethernet network goes in. Even with this, it can make sense to have the management of these systems centralized, most enterprise systems do this already.
Cellular networking gets a lot more complicated with various APNs and other advanced networking concepts. There is a lot more going on than just doing a handshake, pulling an IP address, and starting to talk networking.
A home WiFi AP is doing a pretty straightforward relation of SSID to some Ethernet-like network. Anything talking on the Ethernet network addressing a client goes out the radio, things coming from the client to the Ethernet network goes in. Even with this, it can make sense to have the management of these systems centralized, most enterprise systems do this already.
Cellular networking gets a lot more complicated with various APNs and other advanced networking concepts. There is a lot more going on than just doing a handshake, pulling an IP address, and starting to talk networking.