Some statistics.
Count of Manga on My Anime List: 40,000+ (unable to get exact number) - All these manga are of professional level enough to be included in the database.
Count of Manga serialized in a magazine: 1760+ - All these manga have an editor, most have assistants, and are generally get screened for plot and art quality.
Count of total Webtoons as Featured/Premium (to meet the professional standard above)
300 on Webtoons
240 on Tapas
102 on Lezhin
Cannot get a good count on webcomicsapp
I'm sure there's some more on some other sites.
Total amount of webtoons I think is not a good metric (its 52k+ btw) because many of these series are very very messy, no editing, no quality screening, and a chunk of people use the Webtoons/Tapas database as art galleries, to upload their favorite tokyo ghoul fanart, diaries, or placeholders. Many of these Webtoons in discover never moved past 1-4 panels in chapter one.
Anyway, you can see that overall there is far less Webtoon-format content that receives professional editor attention than there is Manga. Manga has been around for so so long, and Webtoons in my honest opinion has only picked up in the west in the past 2 years.
It's important to also realize the cultural lens you're looking through. Here in the west, manga and webcomic readers ARE disconnected. But in Korea, where Webtoons were popularized (and this has like 10 years of influence under its belt), Webtoons are THE thing. And many Webtoons readers also read manga.
But also Noblesse is ranked #76 in popularity on myanimelist so I don't think the disconnect is as great as it might seem at first glance.
I do not think the format is a detriment to action-focused scenes. I just think we have yet to see a Webtoon that pulls this off successfully. The medium is not nearly as restricting as others make it out to be, literally all it is is the panels are stacked vertically. A lot of webtoon artists choose to spread out their panels waaaay far, but there's no reason they can't be squished together during more action-focused scenes. Just no one has successfully executed it yet.
Rather than seeing it as a disconnect, I think this should be seen as an opportunity. There is a distinct lack of "bridge" series' from manga to Webtoon. Use that niche to your advantage. I personally made a manga-inspired webtoon (with action!), and got a huge subscriber base near-immediately because people WANT to see this kind of content. Webtoons is honestly in it's infancy and now is the time to hop on and carve yourself into the medium.