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LoopBack is built on top of express. You can use express routing and middleware with LoopBack as is.

Express allows you to expose HTTP endpoints as APIs but it doesn't facilitate the quest to build/aggregate/protect/document APIs that interacts with various backend systems, such as DBs, Cloud services, and internal REST/SOAP APIs. LoopBack is positioned to be a fully-fledged API server with SDKs for JS, iOS, and Android.

Loopback is built on top of Express, it'd be sad if they had to reinvent the wheel I reckon

It fills the gaps of Express so that you don't have to write so much plumbing.