It'd be nice to have a pipe attachment which has an integrated inventory in order to get items from blocks that only work if there is an inventory available.
The pipes could then be fed into a RefinedStorage importer, for more processing, not requiring thousands of interfaces on e.g. https://github.com/thraaawn/BonsaiTrees or https://github.com/Darkhax-Minecraft/BotanyPots.

Possible configurations:
BasicInventoryAttachment: BasicExtractorAttachment with Chest
ImprovedInventoryAttachment: ImprovedExtractorAttachment with Chest, or BasicInventoryAttachment with ImprovedExtractorAttachment recipe.
Advanced, Elite and Ultimate work the same as Improved.

Each tier might limit the number of unique items and their internally stored quantity. There should not be any manual access to the attachments inventory possible.
All inventory attachments work the same as their extractor attachment counterpart - with filtering removed.

The UI/Waila-tooltip could print how many items of each type there are in the attachment to be transported away.

No, sorry.