If you stick to marcel commands and python functions, then all the processing happens in a single Python process (with a small number of exceptions). Beside the

If you stick to marcel commands and python functions, then all the processing happens in a single Python process (with a small number of exceptions). Beside the process overhead, this approach also avoids serialization/deserialization costs, and even string copying costs. x | y | z just passes Python tuples from one command to another via function call. Can you expand on your first point? Why are tabular and hierarchical output so important for your work?