Image Opacity for Editor

Yep I agree. I had a similar idea with using the Imgix modifier expressions as there are a ton of image processing options that can be pulled in.

See my post:

With that said, something more native could be handy too without using Imgix, such as directly having an option on the Image element itself. Workaround is to expose the ID and use a little CSS if needed, but some inbuilt features would be a welcome addition.