File Size and Workflow

It appears that an unflattened image processed from LR is much larger than when the same image is processed through Bridge. For example, a 9.5mb DNG becomes a 216.5mb image after Curves, Levels, and Unsharp Mask when processed as a Smart Object in PS. The same file processed with the same adjustments through Bridge is 139.4mb.
Once the image is flattened, there is little difference in file size whether processed in LR or PS.
For my work flow, it seems appropriate to commit to the adjustments, flatten, reduce the image size, and convert to 8-bit. The 216.5mb file then becomes a 5mb file. For the rare occasion that I want to reprocess a file, I just have to do it all over again starting from the DNG. This defeats the main benefit of being able to tweak the adjustments using Smart Objects, but my storage demands are greatly reduced.
For those really rare times when I have a large investment of time adjusting an image, it makes sense to process is through Bridge and save the large file. However, I can see no benefit to opening such an image from LR.

> but my storage demands are greatly reduced
HDs are getting bigger and cheaper. Time is getting less - and therefore more valuable.
Get a new disk and live a little. ;-)

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