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I don't think it has to do with terminology.
As @VectorStyler said, this is a new concept that is not found in any drawing/graphical/design app. So I'm trying to think like when a new user (beginner or advanced or whatever background) test drives this application and finds this "multiple canvases" concept with parents and children and reference and artwork and roles and so forth.
As someone (the new user) who never seen the existence of such feature, how will they react to this? Say, on a scale of 1-10 how easy it is not only to understand but also to apply and use what multiple canvases offer in practice?
Let's say they open the Canvas & Artboard Panel and they see "Reference Canvas" and you were to ask them "What do you think this means? What does this do? Why is it called reference? Does it reference something, if so what?" What would they say? How easy it is to guess what the role of a reference canvas is? People who come from the world of Adobe, Affinity, Autodesk, Maxxon, or any other products that has a document, canvas, artboard, and layers, how easy it is for them to understand the concept?
Not to mention the world of "roles" that can be attached to the canvases.
The way I see it, there are two options:
They dig in and try to understand
They don't understand, get confused, and one way or another they give up because they don't care.
Now, let's assume there are bugs lurking in the various canvases and their roles and options. If people find all this confusing and they don't dig in and try to understand how all this will be beneficial in a design, the bugs will never be discovered. You will only discover bugs if you start using it in a project. But if it's confusing, you don't understand, or just don't care, then you will never use it. If most users will never use it, then what's the point having it? Just to have it there?
Is there anyone who is actively using this application in the past 2+ or so years took advantage of these multiple canvases and their roles and hierarchies in a project?
Look at @b77's question above. I assume he is using this app for awhile and yet he still has questions for not understanding certain concepts about it. If something is overly complex, does it encourage users to use it? I read the manual about multiple canvases and roles and many things are still not clear.
Anyhow...just thinking out loud.