Over the course of 25 years of development with TM1 a lot of know how and experience has been built up. From this, modules were created that are used again and again in projects in order to get faster and more cost-effective results.
With the ongoing development of TM1 up to now to IBM Planning Analytics, these modules are constantly being adapted and optimized.
The options offered by IBM Planning Analytics are used when they fit the needs. If this is not the case, your own modules will be used.