But... you want people to use the software you make as a developer, I assume? In the same way that Blender provides an input mode for Maya users, Inkscape could provide input modes for Illustrator users.
FOSS is supposed to serve people, if your system can easily accommodate that, I see absolutely no reason not to other than some ideological desire to be different.
If someone that has been using Illustrator for years tries Inkscape and goes "Why the hell would it work like that, that's insane", then gives up, that doesn't serve that user nor FOSS, and they go back to paying Adobe.
FOSS is supposed to serve people, if your system can easily accommodate that, I see absolutely no reason not to other than some ideological desire to be different.
If someone that has been using Illustrator for years tries Inkscape and goes "Why the hell would it work like that, that's insane", then gives up, that doesn't serve that user nor FOSS, and they go back to paying Adobe.