There are a few EIPs left that uses the old xxxRef style that are from Camel v1 and early days of v2 where spring xml <beans> files was ruling and attributes was xxx-ref or xxxRef style.
Today Camel is more powerful and modern, and a -ref is no longer needed as Camel can do more, so you can eg say
- strategy-ref: myStrategy
- strategy: #bean:myStrategy
- strategy: #class:com.foo.MyStrategyClass