Custom Workflows

We've been using multiple custom workflows for various projects. The Marketing team is relatively new to Wrike, while I've been using it for around 6 years. The problem is that there is no standard for workflows and they all vary slightly. Is there a recommended number of custom workflows that an organization should use or best practices around Custom Workflows that I can show to my leadership team? I would really like to implement one workflow for all projects but need more data to illustrate the case for this. Any suggestions?