She consented to this, was an adult at the time, got paid for it and moved on

Sorry, consented to what? And what does that have to do with this? The existence of the photo or its continued use as a photo and as porn are not at issue.

Do note that Playboy has the rights of the photo though, not her

And again, this isn't a rights issue. Lena isn't upset because her rights are being violated, and neither is anyone else.

I never said that.

And I never said photos of shoulders are porn. You made a straw man or my argument, so I made a straw man or yours. Neither one was particularly useful to discuss.

Of course there were reasons the photo was chosen originally, convenience and the fact that it has just the right amount of complicated detail. But those don't really matter now because, as you said:

It's an old photo, along with all the other photos of the time it should've been retired ages ago, on technical grounds.

People are upset because the use of a photo from a porn shoot, especially one that has no other particular reason to use it besides "tradition," is emblematic of a culture that is exclusionary to women.

Any defense of the use of this photo which does not address those points isn't really a good faith argument.