I think I understand your logic for the new MC12 "Add Folder to Library" dialog. It is cleaner and simpler however I think we have lost an important feature from MC11.
I have a large database (100K+ items) and am fanatical about keeping it clean. I manually add all media to the database after ensuring the tags, artwork, file folder/names are perfect.
MC is remarkably stable however it does crash from time to time. I also observe unexplained events every couple months, such as a few random files magically becoming unimported from the database. And of course user errors also occur from time to time
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My meda is organized into broad types such as Music, Movies, Podcasts, Books, Comedy, etc.. Each type has its own root folder, and these roots are often on different drives.
The best (and only method) I have found to check the integrity of my database with MC11 is to "Import Media" with each of the media type folder roots selected and the options "fix or remove broken links" and "update library for external changes" selected. When the operation completes and reports "0 files added" I know my database is healthy. On the other hand, if it reports added files or fixed broken links I know something bad happened and I can read the detailed import log to figure out what happened.
With MC12 this procedure becomes a real pain because I must manually select each media type root folder and do them one by one. I am also not confident that it is doing what I expect since the options "fix or remove broken links" and "update library for external file changes" no longer exist.
Please put back the MC11 Import Media dialog. Everything else except this appears to be a step forward for MC12.
Keep up the good work.