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Attributes, Potion Effects, and Enchantments.

It would be nice if attributes, potion effects, and enchantments worked more similarly to each other, with a few necessary adjustments.

First, it would be nice if attributes, potion effects, and enchantments could all vary in magnitude by any amount rather than just integer amounts (like, jump boost 1.5 would make you jump 2.15625 blocks high).

When applied to items in commands, attributes and enchantments could easily use the same tag. The layout could be like this: {Attributes:[{ Name: "minecraft:speed", Magnitude: 2.71828183, Slot: "inventory_17"}]}
Slot 17 corresponds to the top right inventory slot. This way, you could modify a player's movement speed etc. from an item in a set inventory slot rather than force them to hold onto something or wear a certain armor piece.
This layout does away with operation, UUIDLeast, and UUIDMost which were always pretty unnecessary. Just make the default operation be add (and make sure the addition works with multiple items/effects modifying a value).

Negative magnitudes should also work. Say you have a helmet that reduces max health by 3 hearts. The tag would look like this: {Attributes:[{ Name: "minecraft:health", Magnitude: -6, Slot: "head"}]}
Now, for things that only make sense for integer values (like health boost), you could have it so numbers like 2.472 get rounded to the nearest integer.

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    Registered User commented
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    Now, for attributes affecting entities, it's gonna have to be a bit different. The tag could look like this: {ActiveAttributes:[{ Name: "minecraft:armor", Magnitude: 8, Duration: 1200}]}
    Which would correspond to having an extra diamond chestplate worth of armor for one minute. For infinite duration (and for describing an entities base properties), something like this might work: {BaseAttributes:[{ Name: "minecraft:health", Magnitude: 20}]}

    For potions, a tag like this could be used: {PotionAttributes:[{ Name: "minecraft:speed", Magnitude: 1, Duration: 1200}]}
    A potion with this tag would increase the affected entity's speed attribute by 1 unit for a minute.

    Combining attributes and enchantments in this way leads to an issue with anvils and combining enchantments. One solution is to add an optional tag to mark an attribute as an enchantment and thus combine-able in an anvil {Attributes:[{ Name: "minecraft:sharpness", Magnitude: 3, Slot: "mainhand", IsEnchantment: true}]}
    Another solution is just make it so the anvil only recognizes certain attributes as valid things to combine.

    There's also an issue of the enchantment glimmer. Maybe an item could get the enchantment glimmer from having an attribute with {IsEnchantment: true}, but I think it would be nice to have a simple {glimmer: 1} tag. This would make it easier to give custom items that glimmer without having to add an entire dummy enchantment anyway.

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    Registered User commented
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    Finally consider what the effect of all these (admittedly wide reaching) changes would be. The option would be open to have enchantment tables that can spit out randomized non-integer enchantments in a future update. Any new effect could be used in many ways. Since all types of effects would then work the same as each other, it's easier for new players to learn how to use commands. With all the tags being simplified, it could be easier to add new effects in the future. This could reduce lag since custom armor can give "potion effects" directly, rather than requiring a command to give players wearing that armor the effect.

    I do not suggest that this would be trivial to implement, but this would make this particular aspect of the game much smoother to work with.