I thought about that too. Jo and Vee literally spent years working to build a "positive" co-parenting relationship with Kail, eating TONS of shit and giving her a million second chances while she only marginally gained self-awareness and minimally expressed gratitude for all that they did for her and forgave her for. I'm sure that Vee, especially, found it very hard to set all of Kail's assholery aside and truly embrace their "crazy blended family" and even support her daughter getting close to Kail.
Then, the first time Jo doesn't bend to her will (in a situation in which Kail was totally wrong), Kail goes ballistic in 2.0 seconds and is quick to turn on them, even Vivi. What the everliving fuck? Personally, I would be very reluctant to encourage any type of relationship between Kail and Vivi after that. How will it affect Vivi when she's 5 or 8 or 11 and Kail, someone she's known all her life, whom she's been taught to view as family, suddenly severs all ties with her because her parent(s) did something to piss Kail off? And the thing is, Kail isn't just some random neighbor or friend whom the Riveras can let drift out of Vivi's life. She's always going to be around and she's always going to be an important figure in their lives. If Kail weren't such an asshole and so immature, she'd realize that too and try to maintain at least basic civility with them. But, as we saw with her behavior at Isaac's basketball practice, Lincoln's soccer games, etc., etc., she doesn't give a fuck how her petty bullshit affects her kids. So that puts Jo and Vee (and Javi and Lauren) in the position of having to accommodate her as much as they can stomach ALL THE TIME because they know she has no problem making everyone, including her (and their) kids, pay if she doesn't get her way.
I feel bad for Jo, Javi, and their partners because their future with Kail won't be pretty. I think we have already witnessed her best years as a mom and it's going to be mostly downhill from here. Once she reached a point where she didn't need a man to support her, she showed herself to be into a "bad boy." If I were Jo or Javi, I'd be very worried. After Chris gets done using her, I'd assume she'll look for other "bad boys" who treat her/her kids like shit and generally cause chaos in her life (and, therefore, the lives of her kids and their dads). When she's not making $300K+, the chaos will be a lot worse for everyone.