Actually 5G provides this overhaul, more than it provides speed benefits for customers.
The 4G backend still has a web of trust between operators and their e.g. IP exchange providers. As far as I know, this will change with 5G.
Roaming data confidentiality can then be routed and encrypted until the home operator network, while the associated metadata is accessible for the IP X to provide their services.
The home operator can verify the smartphone is actually in the visited network.
These are all bits and pieces that break up the operator's web of trust.
The 4G backend still has a web of trust between operators and their e.g. IP exchange providers. As far as I know, this will change with 5G.
Roaming data confidentiality can then be routed and encrypted until the home operator network, while the associated metadata is accessible for the IP X to provide their services.
The home operator can verify the smartphone is actually in the visited network.
These are all bits and pieces that break up the operator's web of trust.