When you adjust the opacity of a video layer, Premiere shouldn't automatically create a keyframe
For some reason, opacity is the only value in the Effects Controls that automatically creates a keyframe when you change it? Why? Nine times out of ten, I want to adjust the opacity, not animate it. I always have to take the extra step of turning off animation to remove the keyframe. Thanks for reading.

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David X. -ND Faulkner commented
Hi Adobe
I agree totally with original post.
Usually, I just want to adjust the value of the opacity across the whole clip.
If I wanted to animate the parameters I would expect to click on the stopwatch to enable keyframing. -
Stefan Gruenwedel commented
Having this sole setting toggled on for keyframing doesn't make sense. I always have to turn it off — after first realizing (again) that making an adjustment inadvertently added an Opacity keyframe.