Artstyle

As an artist, I agree. Things that are stylized in the way that the prev artist is good at is sometimes things dat cant be replicate by others.

Plus the commentors are all insulting + making negative comments on the current artist is definitely going to take a toll on their mental health

Seeing that the manhwa didnt go into a major long hiatus, safe to say that the current artist is defo being forced to adapt to the new artstyle. Korean publishing companies dont really have the best record in taking care of their artists properly afterall

I completely agree. I'm sure the new artist is very talented, but copying the previous artist's style (especially one of that quality) isn't easy. I also feel bad if they had to adapt so quickly just to avoid a long hiatus. And u're right, Korean publishing companies don't always seem to prioritize their artists' well-being, that's a lot of case manhwa artist ended up with serious health issues or injuries.
As someone who's really sensitive to art quality, I have to admit I'm one of the readers who ended up dropping the manhwa because the change was just too noticeable. I just hope the previous artist can return someday, or if that's not possible, maybe both artists could collaborate to reduce the workload.