Provider Pipe vs Provider Module for example

Intuitivly there should be only the provider module or is it still in there cause of compability issues?

modules used to be second class citizens compared to full pipes (as they don't need to do allot of stuff), but over time i think they have become closer. Also, providers and crafters are a bit redundant; providers are just crafters with a priority of -1 that need nothing delivered, has the number of things they can send fixed by their inventory, not what others can provide.

Provider pipe has to deal with inventories on all sides, modules don't.