Same issue here, without the function of remember layers the most library elements become useless for us.
Especially because we and our customers need the layers for the proofing process within our production lines, as we created specific layers within the PDF files. This force us to manually c&p library elements. What a step backwards. By the way, god help you if you have linked some elements from the library with actual documents, and you need the function create acrobat layers from Illustrator layers, this leads the function ad absurdum.
Same issue here, without the function of remember layers the most library elements become useless for us.
Especially because we and our customers need the layers for the proofing process within our production lines, as we created specific layers within the PDF files. This force us to manually c&p library elements. What a step backwards. By the way, god help you if you have linked some elements from the library with actual documents, and you need the function create acrobat layers from Illustrator layers, this leads the function ad absurdum.