The idea is to eliminate mode-dependent keystrokes and menus; make the library filter available whilst developing; be able to select the next photo for development from a folder or a thumbnail grid, instead of a one-line filmstrip or a collection; make the before-after comparison available while reviewing in the "library"; have the clipping indicators be available for quick-develop; be able to view photo-info/metadata in mid-develop; be able to do relative adjustments (quick develop) or absolute while developing; ...etc...; and last but certainly not least: eliminate mode-switching/re-rendering lag.
Many people have preconceived notions of what this integration would entail. Some assume the contents of the develop panels would just be dumped in with the library panels. But, there are many other possibilities.
Summary, by way of example:
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If Adobe could find a way to change:
"Lets see, I'm in the Library Mode, so '\' will do the filters, not the before-after view...", and
"I want to make relative adjustments in bulk, so I need to switch to library module", ...
"and now that I want to develop again, I have to wait 'X' seconds for a re-rendering..."
To:
'\' is for lib filters, '/' is for before-after.
Click 'Relative' for relative adjustments, click again for absolute.
No waiting anymore for mode switching / re-rendering...
Many of us would be grateful...
PS - If the ACR caching were more effective, the smaller switching lag would be more bearable, but that's only part of the problem...
Rob