Blur object background
I'd like to see a blur option where objects behind an object appear blurred such as in the attachment. This is something that, I believe, can be achieved in CSS so it would be good to have the ability to use such an effect in Illustrator.
This one about motion blur should be upvoted too:
Add ‘Blur background’ feature like XD, including outer and inner shadow
Floyd Rima commented
Can we have blurr behind like in adobe Xd .
This would be great for designing if you need to blurr multiple objects in full or partially rather than adjusting for each layer or shape .Its a long process just to partially blurr an object because you have to play around with clip mask , but if there was a blurr behind feature it would be easier.
add background blur like adobe xd
Olivier Robert commented
This should be upvoted a lot. This effect is now supported in all major browser using CSS (see backdrop-filter) and is an effect broadly used in today's modern design.
This concept could be broaden to 'Allow separate transparency masks for each appearance item'. This will give what you request and more, without breaking existing paradigm.