Several reasons:
* Video codecs are much more complex.
* Random access seek is a lot slower, unless you're using all I-frames. (That's now a codec option on iOS, but not when I started.)
* "Studio swing" reduces the dynamic range of the YCbCr components so the quality suffers.
* Each frame lacks their own thumbnail, unless you maintain an adjunct "thumbnail video"
* Each frame might(?) not be able to have attached separate metadata, like geotagging, sensor settings at time of capture, etc.
* Deleting one frame causes a "hole" and headache.
* Standards compliant JPEG means export is super easy.
* Anything above full HD video is difficult to deal with in 3rd party software.
Several reasons:
* Video codecs are much more complex.
* Random access seek is a lot slower, unless you're using all I-frames. (That's now a codec option on iOS, but not when I started.)
* "Studio swing" reduces the dynamic range of the YCbCr components so the quality suffers.
* Each frame lacks their own thumbnail, unless you maintain an adjunct "thumbnail video"
* Each frame might(?) not be able to have attached separate metadata, like geotagging, sensor settings at time of capture, etc.
* Deleting one frame causes a "hole" and headache.
* Standards compliant JPEG means export is super easy.
* Anything above full HD video is difficult to deal with in 3rd party software.