Yes, the code is treated no differently from any other language. A human has to confirm changes which will impact others.
The key is to act quickly when presented with a plan. It's advised to decline stale pending approvals and kick off a new pipeline for freshness.
There's no magic unfortunately :(
I also think there should never be more than one source of truth for TF, but I have seen two devs fight it out in the development environment. Each add their own SNS topic with similar names, get very weirded out by how it seems to magically change as the other dev applies and deletes the first one and replaces it!