But it doesn't know what you intended. It's guessing. The consequences of guessing incorrectly could be very, very bad, as you are pushing your code to a remote host.

Again, the whole point of git is that it is decentralized; there is no requirement that you have one single central server that you are pushing to; there could easily be multiple places that you might want to push something to.

Using something as default that makes sense for a centralized VCS when git is not centralized is, imho, worse than bad UX, as it teaches incorrect assumptions.

Again, this is table-stakes knowledge for using decentralized version control.