I totally agree with all your points.

We have styles learned under Collections, so furnishing plans and provisioning recipes could also be added there as well. I know there are more of the latter than styles right now, so the list might be considerably longer (especially for plans). It would be nice if they were grouped together and not by chapter/dlc release like they are now for motifs.

I would think that a filter to only show motifs and furnishing plans that you don’t already know would be fairly simple to implement, but I am not an expert in database design. I also don’t know what implications it might have for the time of search and return results, but my guess would be that fewer returned results would be beneficial.

Deconning furnishings and getting back mats would also be a nice feature, though I don’t have storage houses myself. There are always times I craft something and it just doesn’t work like I thought, or I get a better plan and decide to upgrade something. If I can’t find somewhere to make it fit, I just have to sell it to an NPC vendor for a pittance instead.