Automatically apply a consistent, adjustable crossfade transition between multiple selected clips to ensure a smooth viewing experience

Your explanation makes me think you did not try the Slideshow Generator or maybe you did not think about how you would need to change your workflow.

I wrote the slideshow generator with this exact use case in mind. But you do have to change the way you think about your workflow.

First, you stage your clips in the playlist
Then, create a new track for the clips and transitions to live in
Next, you generate the slideshow into the empty track
Preview the result. If you want to change something, you delete all the contents of the track and regenerate the slideshow again - changing a parameter if desired.