Hi @anon64962691,
as @GotnOGuts states in his post here, it’s mostly used when you want to reuse task workers or forms that don’t fit to the process variables that you have in your instance right now. With data manipulation, you can adjust the input for the task or adjust the output from a worker before the process variables are created.
Your first process doesn’t need data manipulation, as you have a lot of freedom to build your forms and task workers from scratch.
Hope this helps, Ingo