OEmbed (remote video) is already handled similarly to other media components,...

OEmbed (remote video) is already handled similarly to other media components, with:

civictheme_preprocess_media__civictheme_remote_video for Remote Video
civictheme_preprocess_media__civictheme_video for Video.

Is there a specific reason to use civictheme_media_get_variables() for this case?
In the current setup, this function is used only for attachments (Documents), and an image which always include an associated file.