What can ACR do that LR can't?

[digitaldog]

Gotta have the last word, Andrew, strike again!,

🤫

[Michael West]

Is there anything that Adobe Camera Raw can do that Lightroom Classic cannot?

In using the select object TOO.....one needn't reselect the tool for each portion of a mask ones "building" 0r otherwise editing...as is necessary win Lightrooma

Lightrooms brush tool doesn't require re selection ...for added Steps but its object tool does.

[Jack Hogan]

Is there anything that Adobe Camera Raw can do that Lightroom Classic cannot?

If you have a compatible monitor and operating system, Adobe Camera Raw has had for the past year or so a High Dynamic Range Output feature preview that really shows off HDR images.  Quite a step forward but so far only available in ACR.

[digitaldog]

If you have a compatible monitor and operating system, Adobe Camera Raw has had for the past year or so a High Dynamic Range Output feature preview that really shows off HDR images.  Quite a step forward but so far only available in ACR.

HDR as a Technology Preview for Adobe Camera Raw came about in April 2023:
https://helpx.adobe.com/camera-raw/using/hdr-output.html
Whatever you find in Adobe Camera Raw isn't far behind in Lightroom Classic (enough said, stay tuned).
FWIW, there are quite a few potentials 'hurt me' buttons with HDR (which is for display only) but that's another topic.

[chrismonti07]

Edit In External editor doesn't limit any RGB conversions unless you apply a parametric edit in LR. You can open an RGB document in an RGB color space that isn't listed in the preferences so, if its in ColorMatch RGB and you simply ask to open in that external editor, LR simply hands of ColorMatch RGB. Unlike what you suggested, when using "Edit in" an external editor, LR allows any RGB profiles to be honored UNLESS you apply proprietary, parametric edits just like it would with raw.