Just discovered that tools enchanted with Fortune give great benefit to yields when used to farm insta-break crops like carrots but do not suffer any durability loss. I found MC-106436 and saw the response by CubeTheThird that this is intentional because "it does not give the player any benefit from using it", but in this case that's demonstrably false, see the following table.

The Fortune-enchanted tool went completely undamaged even after six harvests despite having a substantial impact on the seed/yield increase.

Instructions for quickly replicating the above results:

// World Seed (make sure cheats are enabled) You'll spawn right next to a village farm.
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// Kill all nearby villagers otherwise they will get in the way.
/kill @e[type=minecraft:villager]

// This makes sure the farm regrows quickly.
// Give each replanting ~30seconds to fully grow.
/gamerule randomTickSpeed 1000

// Gives yourself a Fortune hoe
/give @p diamond_hoe{Enchantments:[{id:fortune,lvl:3}]} 1