P: Move [Done] Button from beneath Histogram back to Toolbar [T]

No. The comment started with WE.

Since this is AMAZINGLY showing back up, I'll reiterate what I said earlier. The Done button was muscle memory for me. The way I saw it, if I needed new muscle memory, why not take it as an opportunity to try out Capture One. I did and I am glad I made the switch. Capture One processes RAW files so much better than Lightroom can. The difference is staggering at times. 

That being said, if people are still griping about it a year later, it wasn't muscle memory anyway and who cares at this point? It's gone and has been for a year.

The majority of the people in this thread would seem to disagree with you. 

Agree to disagree? Sure. But don't act all high horse like the great many of us who detest this change are idiots. We have a valid gripe. 

"Was the poster not in fact speaking for themselves?"

Only if he's suffering from some sort of multiple personality disorder; or if he has a hugely distorted idea of the value of his personal opinion. 

No, "WE" don't. 

You might, others might - but the majority of us have just learned to use the software as it's designed to be used, and are getting on with their lives...

What an odd and angry comment... Was the poster not in fact speaking for themselves? 

@lupascuphoto , If you have an issue with your system being laggy then it's best you create a new thread to address that issue.

The issue in this thread is about the "Done button".

I can say for myself that I don't miss the button and don't need it anymore. 

@lupascuphoto I can't say that Lightroom is laggy. On my hardware LR is running smoothly. Is your system up-to-date? Do you have installed all recent updates and patches for the operating system and the device drivers, especially the graphic card? 

Speak for yourself ! I don't miss the DONE button at all, and my system isn't laggy.

WE WANT DONE BUTTON BACK... Also please try to optimise it a bit better, v12 is laggy AF.. and my system aint slow :))