It's been a year or more since I've pursued this issue. I'm hoping someone from Adobe will chime in here. I would love to have the option of exporting files from Lightroom as "Untagged RGB". Rather than get into lengthy debates, I'll answer the question why this way. I prepare images for online display as Untagged RGB for probably the same reason that JPGs on Adobe web pages are also overwhelmingly untagged. For example, if one visits this page
and downloads and opens every image that's in JPG format, one will see that the images are untagged rgb (make sure of course that the program you are opening the files in is not set to automatically convert profiles). I'm sure that Adobe did not happen to make some mistake. Having the option to save as untagged would smooth my workflow greatly. Could this option be added?
I highly doubt that Adobe would ever add a feature to strip the profile and profile tag. It is quite opposite to the philosophy of the program to do that. In the meantime, it is trivial to write a photoshop droplet that does it or to do it using the LR/mogrify plugin.
If you're concerned about the size of the ICC profile (about 3K bytes for sRGB), and you don't want to wait for Adobe to implement your feature request, you can, as Jao suggested, remove them with an Export post-processing command using ExifTool. Using the Run Any Command plugin, run the following command line as an Export post-processing action:
exiftool -icc_profile= -exif:colorspace=srgb file
This strips the sRGB ICC profile and replaces it with the EXIF:ColorSpace tag. (Not all Web browsers assume untagged photos are in sRGB, so adding the EXIF:ColorSpace tag ensures that every Web browser will interpret it as sRGB.)