Do we really have to have multiple options for everything?

For Copy yes, it's a very often used task and it's also available in modules.
To be more consistent in the UI I would strongly recommend to add copy here.
It's 3 clicks to copy an article against 6 clicks for the user.

Sidenote: If the article is not featured / not checked out I see no reason to show an active unfeature / checkin action there

For Copy yes, it's a very often used task and it's also available in modules.

According to what metric?
Personally I only ever use Save as copy

To be more consistent in the UI I would strongly recommend to add copy here.

Then you would have to add it in a lot more places than just articles

For Copy yes, it's a very often used task and it's also available in modules.

According to what metric?
Personally I only ever use Save as copy

According to experienced admin users like me ? for example. :-P

Me, my copywriters and my devs always use the "copy" for K2 articles in J3, because many times it's needed to create a "template" for an article. Populating a web site prototype is so easy with an article duplication system. I missing this for standard articles in J3, it's so annoying enter and click save as copy.
And in this manner i can't duplicate 2 or more different titled articles in one shot.

Then you would have to add it in a lot more places than just articles

Exactly. A rapid "copy" can be a must for menu voices too. No need other options because a simply copy button must clone the menu voice as-is at the same level.
For all others mass management cases, we have the batch.

please test #28881

as #28881 it is still a WIP..... let's reopen this maybe someonelse will be more fast than me ?