From an interview at Adafruit
Adding board level design to the Autodesk portfolio is an interesting and sensible move Given the significant differences between the UI and workflow in EAGLE and most Autodesk products, though, how do you plan to integrate EAGLE into the Autodesk ecosystem without isolating existing customers who have years of experience with EAGLE’s admittedly quirky UI?
I think in some ways one of the things that makes EAGLE special to so many people is its UI. Speaking from experience, there is zero playbook when you build a UI for a tool that is so specific to a domain, especially when you began this long before there were UI standards out there (remember EAGLE is more than 25 years in the making). So I credit the EAGLE developers with managing to build a tool that isn’t surrounded by so much fluff! Can we make improvements? Of course we can, but it’s always a balance and we have to avoid compromising its simplicity for more menu options and workspace panel-creepage.
If you look at Fusion or even Inventor, you’ll notice that as our tools have gotten better, all of the interfaces have actually gotten simpler so I think it’s all trending in the same direction.
As I an educator and EagleCad user for the last five years (and author of some ULPs that add missing functionality to EagleCad) I would like to put in my vote for junking the "quirky" EagleCad interface for one that echoes the way the ENTIRETY OF OTHER GRAPHIC AND DESIGN SOFTWARE works. Old timers will quickly get used to using the mouse the way the rest of the world, and the rest of the their software does. New-comers will not have to read slightly ridiculous tutorials that explain how to work your way around a truly inadequate UI.
As an educator I always have to preface my comments to students with statements like "you have probably never used software this clunky before" and "Yes the mouse works differently than all your other software" and "Yes it does really take three or four clicks to do what you expect to be accomplished in one or two clicks" and "No there is no easy way to align objects, etc, etc"
I and many others have documented Eagle's UI inadequacies for years, many of the missing things should be easy to fix, and users have fixed them for years with ULPs of their own,
so implementing this functionality should be quick and easy. If you wish to see lists of bugs or missing functionality I'll gladly provide my own suggestions. if you search the internet, you can see this material going back years, things like "favorite Eagle bug contest"
As to the mouse question, while a few old-times may complain, using the mouse in a more standard way will quickly grow on them, as they realize that things are "just easier now" and they're not missing the four extra mouse clicks.
Paul Badger