Dispensers "use" any item, if possible

Introduction

Throughout the years, I've seen many posts suggesting that "dispensers should use X item on Y mob/block" and some functionality has been added already, like using shears on sheep.

However, what dispensers can and can't use is somewhat arbitrary: dispensers can shear sheep yet can't take water from a cauldron.

To a new player, there's no way to know which items can be used by a dispenser except by trial and error.

New Player: "Oh, dispensers can wax copper blocks? Surely they can also unwax/deoxidise them if I put an axe in them, right?"

Narrator: "They can't."

In my opinion, dispensers should be able to use any item with a right-click use.

The Suggestion

In order to make dispensers more intuitive and turn them into a general "item user" (as opposed to just a slightly more expensive dropper except in some cases), I came up with a simple algorithm for determining what a dispenser should do with an item.

While some initial bugs are to be expected, this is more maintainable than the current code, which has the current uses hardcoded and must be expanded each time a new use is added, i.e. something that should be avoided when possible.

Below is the pseudocode for an hypothetical function that gets called when a dispenser is activated and should use/dispense an item:

if item has use: # can be right-clicked
    if item is projectile: # more accurately, summons a projectile entity
        shoot projectile entity
        return
    if item targets user: # when the item is used on the player who uses it, like armour
        if has valid target:
            try using as entity # behaves like the entity used the item
            return
    if item targets an entity: # when an item is used by right-clicking an entity, like shears on sheep
        if has valid target:
            try using item on target
            return
    if item targets block: # when an item is used on a block, like a shovel on dirt
        try using on block in front
        return
    if item is placeable: # places a block or entity
        try placing in front
else:
    drop item

If you don't understand what anything of this means, I'm happy to clarify, just leave a comment.

The way this works is: pick an item, follow the structure of the code and stop when you reach a return or the end.

For example, a pumpkin would be equipped on a mob (like a zombie) if one is on front, otherwise places the pumpkin.

Some things to note

• One of Mojang's concerns with this is straying from their design principle about not automating everything. However, we already have quite a bit of automation and some new uses for dispensers are already automatable via other means (like villagers). I believe this still adheres to that principle while allowing a reasonable level of automation.
• I included placing blocks, since I don't think that would be a problem. Dispensers can already place water and lava, which can flow and create many blocks. This is especially true in Java Edition, where dispensers aren't movable by pistons.
• There are many items with many different functions, so there may be some type of item I forgot to account for or something where the resulting behaviour may be undesired. As such, I'd like you to choose an item and follow the pseudocode and tell me if you find any situation that would be undesirable.

Tell me what cool things could be done if this was implemented.