The best practices of a process framework are just that: best practices. The may not be the right practices are a particular environment. Frankly, business drivers are likely to place requirements on the process that have them in a specific way not identified by the process framework. New technologies may provide opportunities that improve the process framework.
The good news is that process frameworks, like ITIL® or BPM, are built to be flexible. Most requirements that occur can be easily adopted to any framework. In process work, start with the framework. Then build the rest from there. In this way, the process framework is used as a guiding principle, rather then a rigid methodology.
In some instances, blending of different frameworks may be necessary. In IT organizations that handle numerous projects, a process framework like ITIL® may need to blend with a project management framework like PMBOK. Or in application development environments, it may be Agile methods. Even other process or Quality frameworks, like Six Sigma or TQM, may have some elements that are adoptable to the current implementation.
In an ever changing business environment, a flexible process framework provides an opportunity to manage that change and identify the best practices to met business requirements.