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This helps you figure out if you’re building VSCO or Facetune.

This is a perfect example of where JtbD is stronger than personas. There are lots of people who use both VSCO and Facetune. The thing differentiating those two cases is what they intend to do with a photo, the job to be done. Another simple example of this type is YouTube vs TikTok. How are the personas different?

The case for personas is stronger within a specific task, for example: iMovie vs Final Cut Pro, ffmpeg vs Adobe Media Encoder. Even then it's not the touchy feely aspects of personas that bring value, but instead the basic market segmentation.