A lot of mangaka and comics authors have or had assistants.
Hergé had 2; Akira Toriyama had 2; Yukito Kishiro have 1; Eiichiro Oda have 5; I’m too lazy to continue the list, it could takes hours and hours to write it, but that’s nothing unusual in world of comics.
For these assistants, role is to draw backgrounds, landscapes, buildings, vehicles, doing flat colors, lights & shadows… the stuff the author don’t have the time or the ability to do himself.
But nobody tells anything because these assistants are invisible humans that’s does the work for the artist 
So from my point of view, having a virtual assistant or a human that helps you to do a part of the boring job, what’s the difference ? 
From whom will use the tool, the laziest will probably just get the result “as this”, the other will rework the result to get something more personal I suppose.
Also I’m not an artist.
Clearly for what I read here about what a “real” artist should be, it’s an evidence I’m probably more than an impostor because I’m cheating a lot: currently to draw a line art artwork, I need stabilizers because I’m shaky, I need a brush not so reactive to pressure because I can’t manage a proper pressure along the line, I often use need spline assistants… I also need to use masks, multiples layers, undo erasers, to be able to draw something really clean… also I need model and I sometime over draw a 3D model… yeah, I’ll never reach the level of true artists.
I’ll probably never use the sketch to line art tool because I’m a little bit m@sochist and I’ll continue to suffer to be able to draw a line, but I do it for myself, not because I consider that how an artist should work… And may be when I’ll be to shaky to continue then I’ll look at this tool as something that I can use.
Grum999