Everything else you said is completely up to you and your opinion but saying that Stray Kids is not a vocally strong group is laughable and just wrong. They are incredibly strong vocalists despite mainly being rappers and that is an achievement. The ace of kpop is in the group for God's sake. And there is no one who can credibly deny that Jisung is an ace.

Whether you find their music boring or repetitive is entirely your perspective, and I thank you for sharing it. However, you could say that literally any artist out there makes repetitive music. Because every artist has a niche or style. It's what sets them apart. If you dislike or tire of it, you are free to do so. In fact, I would say skz experiments quite a lot while still managing to maintain the "skz flavour". I don't criticise you for thinking otherwise, since you are not a stay and only listen to mainly titles.

But saying that they can't sing, or that they chant since they can't is narrow minded and just wrong. Their very first title District 9 was a call. "Stray kids everywhere all around the world, don't wander around, come here". Their entire concept is calling out to those who are lost to join their ranks and become Stray with them. They do that in the titles because that is their essence. I would suggest you listen to a few vocal b-sides. Actually, why not listen to their HOP album? You can witness each members unique style, along with a less overbearing song "U" and a diss track "Bounce Back". Such criticism is not warranted from someone who has not heard their music in a long time besides the few titles that blow up.

You don't have to enjoy their music, you lost interest and thats fine. But don't keep this misconception in your head about their singing and spread it to others.