This is true, you can set the format on your phone, but if you receive images from other people or clients, you cannot modify their phone's settings.
While I agree I could communicate it better, this utility not only converts but also compresses the image so you get 2 core functionalities in a click.
Settings > Camera > Formats
Check 'Most Compatible'
That does the job for images.
Automator will change the format if you shoot video.
Not knocking what you have created, but conversion is not that tricky.