What about the case where you would have multiple managers? For example, today you wrote a FooManager that handles all the Foos, next month you'll write a BarManager, and after that a BazManager and so on. Each of these will probably have a slightly different way of handling things...

Creating pipelines for all of these scenarios seems like it would mean you're doing things consistently across your code base, which will hopefully make it easier to maintain. It also might make it easier to reuse code (you can share filters between different services).