Why do webtoons use unnecessary sfx?

Not an insult. Nothing I'm mad about. There's a good handful of webtoons I'm obsessed with right now that all do this.

Pretty much every webtoon I've seen so far will literally say "turn around" or "glare".

Why is that? I assume most of these people are fans of comics in some capacity. A lot of the sound effects I see are completely unnecessary. And I only notice it in webtoons. Is it a manga thing? I've definitely seen some mangas do similar but never to that extent. Webtoons are absolutely unique in many ways. There's clearly a format/style to them. But I still feel like, just like with a normal comic book or graphic novel, some sound effects are not needed. So I'm curious: why do so many webtoons add these seemingly unnecessary sound effects?