The annoying thing with Finder is when you're in a folder, you start to search, and then it defaults to "This Mac" and not the god damn folder you're in.

Bloody daft.

That's because you have that set in your Finder Settings.

With the Finder open, go to Settings > Advanced, and change the drop-down at the bottom to "Search the Current Folder". This is something I do on the first run of every new Mac I set up.

No, that's because it's a default value, so the complain is 100% spot on. Bad defaults should be treated as a bug.

"Search this Mac" should be confined to Spotlight OR as a fallback if the local folder doesn't return anything.