He’s complaining…because he sells a solution to this problem. I hated Finder when I switched to Mac back in 2007. So much so I bought PathFinder. One thing that pissed me off and still does, is when I copy over a folder with the same name, it doesn’t merge the contents, it deletes everything in the existing folder. That’s not what I expected as a Windows user and it still seems like the wrong behavior almost 20 years later. I no longer use PathFinder, it had its own problems and bugs…but in general I find Finder pretty lacking.

This is not true, it asks to merge or replace (though merge is not always available). It's like that for years already.

If you do option while moving the file it merges both directories but even I didn't know this until I googled it.