Readium LCP support would be a great addition: borrowing books from my local library (in France) is a bit of hellish experience, especially with a recent MacBook Pro.
For a reason I don’t understand, if I’m transferring the borrowed book with ADE 4.5, the book can’t be read by my Kobo device because according to my reader I removed its ADE authorisation (I did not: I could read a book I bought locked by Adobe DRM and transferred with the same ADE 4.5 just fine).
It works with ADE 2, but the certificate of ADE 2 installer was only valid until 2017 (great user experience when you need to bypass an invalid certificate alert
) and, on top of that, it’s a 32-bit application, which means I had to install it on an old Mac, plugged in another room (the last macOS version to support 32-bit apps was release in 2018, support for it stopped 2 years ago and, AFAIK, it's not compatible with Apple Silicon).
If Kobo could take the LCP support they added to Tolino devices and add it to their own Kobo devices, it would be really extra nice: a growing number of French libraries are thinking about replacing ADE with LCP and the experience with ADE will only get worse…