1. Ease of use. Other VCS have more consistent command line interfaces; Git's interface has to be studied. In practice, people end up using GUIs with missing functionality and then end up searching for help, and a lot of real experts come to rely on powerful wrappers like Magit, LazyGit, or JJ.
(Compare to Mercurial, Fossil or Git; those systems have consistent and usable interfaces. There's much less demand for wrappers or LLM tooling since they're easy to use already.)
2. Preservation of history. Two common commands - git rebate and git push -f - cause commit history to be lost, sometimes permanently. ("Just be careful" and "Just don't use those commands" are useful pieces of advice for an individual, and virtually impossible to enforce over groups.)
3. Conflict resolution. Git forces the user to resolve conflicts ASAP so we often lose information about A. What the conflict exactly was, and B. How the individual resolved it. Most VCS have this issue; JJ allows you to commit the conflict and solve it in a separate commit, which is nice.