Ready-to-use bpm migration templates—do they actually get you 50% of the way there, or just move the work downstream?

We’re planning an open-source BPM migration and someone on our team suggested using ready-to-use templates as a starting point instead of building everything from scratch. The pitch is that templates compress the design phase and give you working patterns you can customize.

But I’ve been around long enough to know that templates often look good in the initial setup and then require significant rework once you apply them to real business processes. I’m trying to understand what realistic expectations should be.

Do ready-to-use migration templates actually save time, or do they create technical debt by codifying assumptions that don’t match your specific environment? And if they do save time initially, how much rework do they typically require once you start customizing them for actual processes?

I’m not looking for best-case marketing scenarios. I want to understand from someone who’s actually used these: what percentage of the template typically survives into production, and where do you usually end up spending the most time customizing?