Camera Raw Policy of Writing Back into Input Files

This came up in another thread, and I think it deserves its own discussion.  I'd hope that we can influence the Camera Raw team's future direction.  I welcome your input and opinions.
Given:  Under some conditions Camera Raw writes data back into (overwrites) its input files.
Assuming you use Camera Raw to open your out-of-camera original files as many of us do, Adobe seems to be all over the road on whether to keep its hands off them or overwrite them...
Camera Raw will not touch a proprietary raw file, such as a Canon .CR2 or Nikon .NEF.  There's a whole process for remembering settings in a separate database or sidecar XMP files.  So far so good.
If you open a JPEG, TIFF, or DNG through Camera Raw, data WILL automatically be written back into it to tell another run of Camera Raw in the future what settings you used - without the software ever having warned you it will do so.
Some functions EXPLICITLY rewrite input files.  You can ask the software to write new thumbnails back into DNG files, for example.   This is fine - the user has instructed the software to overwrite the file, and the user is in charge, after all.
Overwriting/rewriting an input file without being instructed to do so is NON-INTUITIVE BEHAVIOR for an application. No one would expect an input file to be overwritten.
We do see that it causes people confusion.  I'm sure there are people right now reading this in disbelief.  I recommend you go test it for yourself (on a copy of one of your original files).
The original file being overwritten is one of the reasons why I don't configure Photoshop to open my out-of-camera JPEGs through Camera Raw.
Adobe's [mis]handling of input files on the surface seems to be derived from the history of DNG - where no camera actually writes the DNG file directly but it has been generated as an intermediate format through the DNG Converter, and as such can be handled with less "care" than an original camera file.
It seems to me that Camera Raw should NEVER write back into an INPUT file it is opening without a) letting the user know or b) being directed to do so.
Adobe:
Please give those of us who don't want our input files overwritten an option for using the database/XMP sidecar instead in EVERY case.
Thanks.
-Noel

Noel wrote: >>  If you open a JPEG, TIFF, or DNG through Camera Raw, data WILL automatically be written back into it to tell another run of Camera Raw in the future what settings you used - without the software ever having warned you it will do so.<<
It depends.
As far as I can tell:
When a JPG or TIF file is Locked,
Camera Raw > Done results in a Write Permission Error.
When a DNG file is Locked,
Camera Raw > Done - writes a separate xmp sidecar file.
The JPG / TIF handling seems to me inconsistent. With a locked file I'd prefer to have a sidecar xmp created as well. Some of my JPG / TIF files are originals for me.
Peter
Windows Vista, CS4 w/ACR 5.7

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