Seems to me that Mackie/Hui and Euphonix, (now Eucon and owned by Avid) were all quite happily cooperating with most DAW software houses until Yamaha launched Nuage in direct competition to Avid upmarket controllers. Up until that point Eucon was leading the race for Nuendo control and was introduced into the Cubase installation routine rather than needing a separate download USB dongle licence.
Steinberg use the SDK protocol as their proprietary bridge between DAW and controller. Avid support claim in their forums that the required SDK for the latest releases of Eucon have been exchanged with Steinberg and I don’t disbelieve them.
Avid also declare in their lates PR releases for Eucon 2018.3.x that Nuendo and Cubase are recognised as authorised, supported Eucon compatible workstations. So, why have Steinberg failed to incorporate the SDK (which they own and devolved along with VST technology) and latest Eucon updates into subsequent Nuendo/Cubase updates and releases?
They have stated in these forums a few years ago that they have indeed recieved then Eucon updated SDK and have the hide channels feature and other fixes reflecting onto Avid controllers working, to be included in the next update.
Three years later, we now have Cubase 10 and the reps and moderators repeatedly and ignorantly I must say, ignore posts and requests for information on anything to do with Eucon.
It seems they may have been instructed by Yamaha not to enter into any discussion on the subject which just casts a disquieting cold grey cloud of mistrust over people who have made substantial investments on Avid controllers.
The latest release of Cubase 10 claims a lot, though, a quick look through these forums clearly shows, and even by Steinbergs own statements doesn’t work properly and will be fixed in a forthcoming upgrade! Really…?
Steinberg have repeatedly shown that a new release can easily be used to brush outstanding bugs and broken features under the GUI carpet and people have become quite aware of that tactic.
Luckily, in this day and age, most people own and multiple DAW’s so purchasing the next all singing release is an option, not a nessecity for a lot of people. Its something that Yamaha/Steinberg seem oblivious to as they race on headlong to make thier flagship products look just like Studio One whilst destroying their own iconic visual branding.
The thing is, Studio One has its own dedicated controller, Cubase doesn’t so people invest in Avid controllers and expect them to work as claimed, they should get on it and do it.