
When you're flipping through reading so many works... it really is hard to notice an art change unless it's so drastic it really has you halting. I've had it happen on maybe 3 occasions, otherwise I don't notice. One, I could see the art changing as the artist grew in skill level, it was amazing to see. Another, there was a long enough break in between that I had to reread to know what happened and saw the change. The last one was just noticeable by the shading and coloring.
This one has an easy to recall plot, so not noticing the art change was easy to miss.

I've read thousands of works and I noticed immediately and I'm constantly flipping through different ones it was necessarily a bad change for me though it just doesn't seem like the same characters when they had such a huge personality and look change so I cant read it anymore but everyone is different I just feel like I have to justify dropping this
I didn’t even notice the change in art style! I was so focused on him being super strong and merciless that I didn’t even mind it.