Not everybody uses pipeworks, so tubelib support is required.
If tubelib support was provided, terumet support would not be needed since the tubelib upgrade or input / output upgrade could be used.
However, terumet can already insert and remove items from the digilines chest if the chest is configured as the input or output when the input / output upgrade is being used - but it doesn't send any events.
Not everybody uses pipeworks, so tubelib support is required.
If tubelib support was provided, terumet support would not be needed since the tubelib upgrade or input / output upgrade could be used.
However, terumet can already insert and remove items from the digilines chest if the chest is configured as the input or output when the input / output upgrade is being used - but it doesn't send any events.
This could be worked-around if https://github.com/minetest-mods/digilines/issues/42 were taken care of.