It does take a certain amount of mental hopscotch to jump from one vector graphics application to another. The jump is more difficult if the user has worked exclusively in just one of those applications. There is a lot of big differences between Adobe Illustrator and CorelDRAW. I very much prefer CorelDRAW for certain kinds of tasks, but I'll choose Illustrator for other things.
The desire to switch really has to be there, in order to do it. Have to really don't mind dealing with the teething pains on switching. Not only may features not be there, but they actually may be implemented in ways that one doesn't like (which really goes back to what you were saying in that they know (and thus prefer) the Ai or Draw way) and that can be off putting. The more that one has bounced around between applications throughout their time, really does help. Shoot, I have known some people that don't like it when there are simple UI changes within the program that they know. Much less go from one program to a totally different one.
I certainly wouldn't ever suggest switching cold turkey from one program to another. Although the downside is that people sometimes slip back into what they know, but that goes back to again, the desire to switch.
Affinity Designer has its own user interface differences (as well frustrations from certain features that haven't been built into it yet). Inkscape is packed with more features, but the user interface is very clunky and old looking. That can make it pretty annoying to use when coming from a CorelDRAW or Illustrator environment.
GTK (the UI widget toolkit that Inkscape uses (and GIMP, I really don't like GIMP's UI compared to Inkscape, but I digress)), in my mind is one of the worst UI toolkits out there (much prefer Qt (Krita, VLC, Teamviewer, Maya uses this, although I think Maya is QML which is the latest from Qt, or "cute"). No wonder the latest trend is to use OpenGL/Vulkan (METAL for the Mac people), which does allow for easier UI changes versus the traditional widget usage (I actually like the immediate mode much more, but I digress).
Inkscape does have one option that I really do like to have, but that option isn't really for everyone.