Maximum Limit of nodes in Process Model

As with all of the Best Practices and Guides they are not hard limits, but guidance. You always have to consider the context in which you're considering these values, and have an understanding of why such limits are even being suggested. You can then make risk-based decisions as to whether you need to address the recommendations or not. Because, in the end, it's about risk management: the likelihood, and the impact, and what (if any) mitigations you choose to apply. 

As with all of the Best Practices and Guides they are not hard limits, but guidance. You always have to consider the context in which you're considering these values, and have an understanding of why such limits are even being suggested. You can then make risk-based decisions as to whether you need to address the recommendations or not. Because, in the end, it's about risk management: the likelihood, and the impact, and what (if any) mitigations you choose to apply.