Inconsistent UI/UX regarding key-frame decorators throughout all the Properties Editor

Depending on the Render Engine you choose, those decorators will appear or not (even for the same parameters):

What are they for and why is that?

Let's start with the premise that they are invitations to the user saying: "Hey, did you know you can key-frame me?! Press me and you'll see!"

Considering that, you'd expect they were present in every (or almost every) key-framable property, right?

The Inconsistency Problem

Look for example View Layer Property Tab above: You will see only one decorator at the top for "Use for Rendering".

• Hovering your mouse over and pressing 'I' performs an "Insert Keyframe" operation that has the same functionality as the decorator.
• But now look how many other parameters here accept keyframes and they are not showing the decorators.
• And look at Volume: Light and Transparent. They won't accept keyframes mixed between all the others that accept.

What conclusion can we take from that?

Whatever is the purpose of a keyframe decorator in Blender, it is not being applied consistently throughout the interface.

What we need?

1. We need that Blender Devs come to a conclusion of what these decorators are for
2. Clearly define when they should be applied to the UI/UX
3. From that point, we as a community would be able to submit patches ensuring the concept is being applied consistently
4. Create a consistent UI/UX regarding keyframe decorators

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Why I'm creating this RCS?

Because I create addons, and we know that it's always advised to build our UI/UX based on Blender's default way.

It's ironic that when I'm developing a UI/UX, I'm forced to build based on these inconsistencies to keep it "looking normal" for the end user.

In the end of the day, it's more work for everyone.