No?

What problems, exactly, are you suggesting exist? I have used jj extensively on git teams and it has been seamless. The only people who have noticed or cared are the coworkers I’ve gotten to join me.

How so? I've used `jj` locally on teams where most (if not all) of the other team members were using git, and they only found out I was using `jj` when I told them.

You're confusing mixing git and jj in your local copy of the repo vs what it looks like to other people. You can use jj locally, and it interoperates perfectly with any git remote, and no one has to know you're even using it. From the point of view of other people, it doesn't matter.

I don't understand what you mean. The team I currently work with is 100% git while I only use jj anymore, and I've had zero issues?

fwiw I don't use it personally but some people on my team use it while the others use git, and nobody complains.