Trailblazer looks interesting, and there are a lot of good ideas in here. One issue I have with it after reading the documentation is that the code is organized around "Concepts" and at the core of each Concept appears to be a single Model. All of the Form, Presenter, and other Operation objects live within a Model's namespace where often the @model is implicit. This works well if your business logic only applies to CRUD operations on individual Models, but in reality that is rarely the case.

I tend to use a service object abstraction based around concerns, or "business stories". My service objects map to specific scenarios or pieces of business logic that often utilize multiple underlying Models and/or other entities (eg. third party interactions services).

It wasn't clear to me whether such a scenario is discouraged with Trailblazer, or maybe not even possible.