When equipping armor by shift-clicking, dispensing armor onto player, or just left-clicking armor into the armor slots through the inventory, it doesn't play the armor equip sounds.
The sounds only play if you equip armor by right-clicking armor that you hold in your hand, or when you equip armor onto an armor stand by hand or with a dispenser.
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Since equiping armor on a horse does make sound when right-clicked, I can confirm that this is a bug, not a WAI feature.
This issue was "fixed", but it was fixed quite poorly, resulting in the equip sound being played in numerous situations where it shouldn't be played.
Detailed in this video: https://youtu.be/VFv7incNxdQ
And each of those situations have already been reported, and a large amount of them fixed for next snapshot...
This has been awfully fixed it almost seems like you don't have testers at all. As Joey Sodergren stated 4 days ago, now the sound plays anytime the durability of the armor/elytra changes.
Edit: Just found this is being talked about in a new bug report being MC-251859
@unknown being a human comes with making mistakes. 😃 That issue is currently being tracked at MC-251859.
Can confirm. This should be fixed, since it's not often that people equip armor by right-clicking armor that they're holding in their hand.