I have recently purchased a seed vault and it's very nice to have an extra 100 slots for storage.
I think that the GUI for storing and removing seeds is in need of a quality of life updates.
-Seed vault can only be accessed from Furniture option, there is no way to interact with the seed vault without first opening it up, clicking on the vault and then selecting the seed icon.
-To add seeds, you can only put one seed type in at a time. You also cannot put one single seed in, without the option of multi seed deposit to come up.
-To remove seeds, same issue. It is very not user friendly.
-Perhaps a menu such as the one in the "Quick-Sell" menu, can be implemented for the Seed Vault. It would allow for selecting multiple quantities and multiple types of seeds at once.