challenges of the Backbone IP redirection

Dear friend!
IP redirection means that the OTN network can split IP data flows on the backbone network. Large-capacity services (such as 200E/400G) are transmitted at the optical layer, and small-traffic services (such as GE/10GE/40GE) are transmitted at the electrical layer.
Currently, this solution can be used to solve most scenarios on enterprise networks. They face adjustments that make the network layer more complex and require higher skills of O&M engineers.
Thank you!