Its crazy how even basic knowledge of these languages provide a better experience than some translation groups. Tho I don't really know how basic you mean, its still crazy. (Man I HATE lazy translation groups)
Naruto went downhill especially at the new gen, the fillers in both the old and new gen are annoying too. Tho I also liked Naruto ngl, I don't really understand why theres so much hate for it. Maybe the hate is because some people find it childish?
I think the longest and probably one of the best manhwas I read is "Tower Of Gòd" at around 650 something chapters now. But I also had experience with some authors dragging out their story, I think it was "Tomb Raider King" or sth like that. (This one's completed you can read it if you like action and stuff, it wasn't that bad but was annoying at the end) It instantly made my reading experience so much worse. But you seem like you're more experienced in this field than me. And I'm so glad to see that I'm not the only one that just doesn't have the patience to re-read an entire manhwa. I though I was also getting infected with the tiktok 5 second attention span disease