I wouldn’t say that webcomics are are net worse medium for storytelling than manga panelling, it’s just different and can achieve similar things with a different presentation or do things that you can’t do restricted to a paged format.
This particular series, from what I read of the manga could make the scope and scale of the combat scenes a bit more grandiose but that takes talent, skill and understanding of the format. I read more Korean webtoons than Japanese ones so I’m not sure if the fact manga is still so much more huge in Japan has restricted the approach. I guess we’ll see, or not if no one picks this up.
For myself I like when action scenes flow as one super long panel as you scroll down in webtoons, that and using the fact you can infinitely scroll as a means of passing time or using repeat panels with small changes. Being able to do essentially anything with panel shapes and sizes just a bit more loosely than manga is an advantage too. When the author and artist are skilled these things make it better to have read in the webtoon format.
"For myself I like when action scenes flow as one super long panel as you scroll down in webtoons"
I concede that I don't like action comics, especially fighting ones. I'm more traditional in that if actions are not akin to combat sport, namely not people looking cool swinging things but internal monologues analysing moves and counter-moves and such. That's why I see no advantage of long panels vs comic page. In fact I think it's worse because long panels are inherently incompatible with the usual way we experience the world, namely in a frame. It's akin to being dropped. There's a reason why movie frames are rectangular.
"infinitely scroll as a means of passing time or using repeat panels with small changes"
I agree with the first part. That's something webcomics can do. However, repeated panels with small changes is very common and have been done a lot of times. Comics are used to plan movies all the time, and many comics have used that as well to convey movie-like information. Just look up "Watchmen" and you can see that technique.
"Being able to do essentially anything with panel shapes and sizes just a bit more loosely than manga"
I'll be frank and just say I wholeheartedly disagree. I think the only one I have really seen is a top/bottom long framing. That's nothing out-of-the-ordinary. My example of Kumeta Kouji and Zetsubou-sensei just demonstrated how much they can play with framing. Framing in comics can be very wild or mannered, conveying the artist's own skill and intent.
I have read webcomics from mid 2000s until now and I really have not seen anything in long form format that cannot be done better in a traditional format. I admit that long scroll is still a relatively new format. There's much to develop. However, I went back on long scroll webcomics that I didn't mind such as Tower of God and Lookism. Turns out they were doing it similar to normal comics: compact frames with a lot of dialogues, information distilled. They read more like a book with some illustration than a comic.
In this case, as you have said, it depends on their skill and understanding of the format. This webcomic version is atrocious because they simply broke off a well formed comic with its frame and all and drag it out. That's insulting. That being said, as I have mentioned, I still think long scroll is a way to draw less and offer no other advantage and difference to the medium.