If you’re doing more complex stuff all the time then yes that’s an indication of a problem, but despite your best efforts, complex situations or screw ups do happen and it’s good to know how to fix them, especially if you’re a senior dev that needs to help the rest of the team and resolve conflicts between feature branches. The whole team can’t be perfect all the time.
Also most of the tips in the article aren’t even about branch management and more about optimizations for huge projects or introspection into the history of large projects.
The old code isn’t going anywhere, there are already countless backups and clones. For a fork to actually be meaningful it needs community support and maintainers otherwise it’s basically just a clone.