Also, Kimetsu scans are also pretty recent, and for casual fans that got used to reading it on the app, it's like if they didn't actually exist. Also, sometimes they have even been irregular with releases, so that doesn't help creating much of an effect on the series.
Eh, Kimetsu fan scan has been there from the beginning, and they never miss a single week for the last 3 years. I think you're confusing them with the recent speed scan. The view on Mangaplus is not affected because they always release after the official version drops.
So, the big question for everyone, what do you think is the reason(s) for Samurai 8 underpreforming?
I think it all comes down to one big reason: Samurai 8 is Kishimoto's passion project. Readers don't resonate much with the manga because Kishimoto is writing what he wants to write, rather than what readers want to read. He had wanted to write Sci-Fi for ages, and he couldn't wait to dump all his ideas on Samurai 8. The end result is he made the same mistake as the author of Saiyuki: too much exposition and new concepts introduced at the beginning, which might bore or confuse readers. It's clear that Kishi has great plans in store, and maybe he was counting on readers to give him more time to fresh out the universe (which is quite reasonable if you ask me, he is Naruto's author after all), but it looks like the average Jump reader has no such patience. At the end of the day, people read Jump for fun and entertaining manga, not masterpieces in the making. If you fail to entertain readers then they will drop your manga, no matter what promises it may hold in the future.
The art also didn't help in my opinion. At the beginning, the artist hardly used screentones , which made the manga look more like a coloring book with no contrast between foreground and background. Robots and mechanic devices are extremely detailed too, so everything looks like a clusterfuck without proper shading. Basically the art perfectly mirrored the writing: full of ideas and promises, but confusing and not entertaining enough. Luckily later chapters are much better in this regard.
Finally, the hype surrounding the comeback of Naruto author might have backfired on Samurai 8. The more you talk about it, the more readers will expect from it, and the more disappointed they will be if the first few chapters fail to live up to their expectations. And don't forget that too much advertising might turn people off. Some like to say there is no such thing as bad publicity, but Shueisha might have done it with their millions of Samurai 8 pamphlets included in all Jump volumes released with this batch.