I haven't read much past chapter 10 of Jujutsu Kaisen and only the first three chapters of Act Age (lack of translation is at fault here). While I do enjoy Act age plot more then Jujutsu Kaisen's neither really strike me as all that super appealing. Act Age in my opinion would be more fitting in a monthly magazine. As for Jujutsu Kaisen, I'm not sure if this is just me, but it comes across as kind of a hollow plot similar to how Bozebeat was while it was running for example: the reason the MC is doing the thing he does is paper thin to the point of asking why is this character the MC instead of X other character, a scope in terms of world I'm not really referring to world building with this just what is the "defined" area that the series is currently operating in (is it one city? multiple? ect.), is this a "public" know problem or only the society the MC is apart of know about it, and for what reason does the overall plot have for the X-circumstances to be happening now, what ever time period is taking place. Neither of these series is particularly bad in my opinion just they needed more time to be thought through before being serialized. A little side note connected to Jujustsu Kaisen how many Exorsist manga have gotten switched to another magazine after they first debut in WSJ?
You can look at it this way. WSJ didn't really find anything that could show signs of a stable future for almost two years and they really needed something for their future lineup. They had to put their trust in something and allow something to live and grow.
They are quickly consuming series which can get anime adaptations, at this point all that's left is Bokuben and Dr. Stone and you can bet they already have anime adaptations planned or in production for them.
They need more things for the future. Jujutsu and Act-Age have had the best reception since the round of six new manga from the start of 2017, so why not give them a chance, especially since the authors seem to be able to keep up with the weekly task?
Getting rid of Act-Age and Jujutsu would make the scenario from above even worse. They could try getting something that's much better than Act-Age and Jujutsu for some people, but what are the chances of that plan being successful?
Let's say that in an opposite scenario, they quickly axed both Jujutsu and Act-Age instead of how things are right now.. So in theory they axed them because they wanted something even better, with even better reception, that's even more successful. What if everything else they tried to serialize afterwards had really poor reception and didn't take off in the slightest? Wouldn't things be much worse that way? At that point they would have nothing new and stable for the future, with 2-3 years passing by since their last success, Dr. Stone.
In my eyes, it makes the most sense to keep the things that have most positive fan reception. Jump have always been about getting fresh ideas into the magazine consistently and constantly. They can't axe everything in their way for three years in a row while hoping they find the next big series. These two deserve a chance, like many other manga from the past did. They can't afford to let a long time pass with nothing new for their future as a magazine.
I personally have fallen in love with both series, like some people from Japan. Right now I can't say I'm the most attached to them, but I feel that will change as long as the series continue to grow and improve. I really feel like they can both improve, since they both have their own flaws and they can improve if they are given the chance to do it.
I will look forward to future serializations and I always hope to see good manga being serialized, it makes me even happier if a new and good manga becomes successful. If either Jujutsu and Act-Age fall flat in their quality at some point, that would be unfortunate, but I don't think it is the wrong choice to allow them to stay if the fans from Japan seem to like these new manga the most out of all of the other recent serialization rounds.
