Why? To find the diamond pickaxes/mangrove propagule/sponge that come from crates To see enchanted variations of items To see available mob spawners To see different colored/aged bucketed fish or axolotls I don't care whether a shulker has been placed or not To see available vote/rare/etc keys by doing /shops find owned tripwire_hook To find who is selling maps/mapart To see the variations of heads for sale I'm sure there are more, but that's all I could think of from the top of my head. The /shops find GUI would need to be updated too. Since we would also need to be able to see, for example, what head we're looking at, or what enchants an item has.
I agree that the shops find gui needs to be more intuitive and inclusive over lored items such as crate prizes. However dex has made it clear several times that its a plugin he can't edit or change much of. Though if it is possible to have the gui show us what items we're lookin for (eg mapart and heads) and to search for colour nametagged items amd keys that would be so more better
Currently not possible unfortunately. For things like keys we can potentially find a different solution though since those items are constant. It's not a third-party plugin however some things are not compatible with the system.
