Hi, the ecoinvent methods are provided as we receive them from the ecoinvent centre, and useful e.g. to reproduce the ecoinvent LCIA results. For our own method pack, we are
a) considering other databases than ecoinvent (not relevant if you are using only ecoinvent but if you are using other databases, evidently)
b) updating the methods, documenting them (see the different documents in https://nexus.openlca.org/documents,
for openLCA LCIA methods), and modifying them to some extent (e.g., adding parameters to allow changing organic carbon calculation)
I hope this helps?