I don't know about competence but if you look at the new series serialized after August 2017, around the time he took the EiC position, its not really an exciting list:
Lycopene- cancelled
Full Drive- cancelled
Golem Hearts- cancelled
Bozebeats- cancelled
Act-age
Jujutsu
Noah's notes
Ziga
Kisetsu
Invade You
Other series that ended after he entered:
Marie
Cross Account
Just from this list, I personally find almost nothing that holds my interest. Act-age seemed interesting but I'm not a huge fan of the premise. Jump Rising is personally a mess. Jujutsu was probably the only thing that seemed good to me and even then it needs quite some work. Ziga seems like it doesn't know what it wants to do. The latest 2 don't appeal to me at all.
From this list I can say that I like Act-age and Noah's Notes, but I don't care for them so much that I would be devastated if they were axed, I'd just feel sad for them. Shuudan was nice but it didn't feel like it belonged in WSJ.
And then I have to wonder, do Jump have some really great new artists and some great new ideas and concepts that are currently being developed? Or are we just going to get more eh series like these ones? I have seen some fantastic artists appear in all kinds of other magazines recently, so I wonder if new talents are just willing to take a risk somewhere else than in Jump. At least in another magazine, if you're a talented artist, then in the best case scenario your manga gains momentum and has a future, even if it never becomes as huge as something from WSJ.. In Jump there is the risk of investing a lot of time and effort into an idea that you consider to be your greatest since you are aiming for success in WSJ, while also being under pressure for a weekly schedule potentially for the first time and then you can have your soul crushed instantly if your manga doesn't gain any traction.
We got some Giga mangaka join WSJ, but I wonder if they're the best ones they could currently get their hands on?
Of course you have veterans, but there's no guarantee that their manga will do well and it's not like there is a great selection of veterans that are completely available for WSJ. Most veterans are busy with something else and most of them probably don't want to do weekly serializations in WSJ anymore. If they can make a manga anywhere else, you bet that's what they'll do, especially if they had very successful manga in the past.
A lot of people are saying that Kishimoto will return, when there is no guarantee that he will return to WSJ. We can't even be certain that he'll even come back to draw manga again even if he said he would return to draw something. Dealing with Naruto weekly couldn't have been easy on him for such a long time. Now that he's had the chance to spend some time relaxing with his family maybe he'll just stick to keeping things this way since he doesn't even need to draw another page of manga for the rest of his life. He could've returned to do Boruto monthly, but he even decided to skip on that.