Is there any benefit to keep the RAW file after editing outside Lightroom creates a TIFF

When working with RAW files in Lightroom and you choose to edit in Photoshop, the only option is "Edit a copy with Lightroom Adjustments" (Edit Original is grayed out). This creates a .TIFF so after you come back from Photoshop you now have two copies of the photo--the RAW file and a TIFF version.
In my normal workflow, I make additional edits to the TIFF file in addition to the changes Photoshop made so I'm left with a "out dated" version of the RAW file. Is there any benefit to keeping the RAW file at that point? I'm doubling my disk usage by keeping it.
Fire away.....

Answering this question:
This got me wonderig why LR turns my 25-30mb CR2 RAW files into 80-95 mb TIFF files when it sends them to Photoshop for editing but Photoshop can open the same 25-30 RAW file in DNG format and save it as a 25-30 mb TIFF. Why are the TIFF's LR creates 3x larger than the ones created by PS?
Camera RAW file formats are compressed to a small file size using manufacturer proprietary information about the image sensor pixel layout. This provides a more efficient loss-less file compression algorithm than TIFF's LZW or ZIP compression algorithms. LZW or ZIP compression is not used when Lightroom exports and opens an image in Photoshop for editing, but you certainly have that option when saving the file after applying your PS edits. DNG files using loss-less compression can produce a file size slightly smaller than RAW format, but I have no experience with DNG.
Answering this question:
CS3 can't read Canon .CR2 RAW files (at least mine can't unless there is a plugin of some kind).
Support for newer camera models like your Canon 7D are only added to the then current (and later version) Adobe Camera RAW Converter and Lightroom. Newer Adobe Camera RAW converter versions (6.3) are not supported in older version of Photoshop like CS3. It is the nature of business marketing and also due to the large expense to support older application versions with "new" plug-in features. It would be a support nightmare!
Hypothetical Example:
"Why doesn't Adobe Camera RAW 10.3 work properly with my Canon 1600 D MK XV 45 Megapixel camera in Photoshop CS3?"

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Is there any benefit to keep the RAW file after editing outside Lightroom creates a TIFF

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