The problem isn't just the icons but the inconsistency. This link mentioned in the source article illustrates it well: https://tonsky.me/blog/tahoe-icons/

For a company that used to pride itself on its clean and consistent UI, this is really shoddy work. It feels like Microsoft now, every app designed by a different team and nobody coordinating together.

And this would have been a really minor job to coordinate properly. It probably would have saved time in fact having predefined icons for common functions. Now theres been 8 designers working on a different icon for the same function. It seems just complete disinterest in consistency. "Just do whatever" is not the apple way.