The Mac is mouse-centric. You double click to open anything , you right-click to access other operations.
Or command+click because up until osx, or even way later than that macOS didnt even had rightclick.
If you single-click and then start using using the keyboard, it’s a fair bet that you want to rename it.
I didn’t single-click on an item. I moved to the item with CURSOR KEYS and then hit enter. Why does the finder half asses this interaction (and moving a folder up) while moving the cursor and selecting/unselecting items is done like on other plattforms?
I’m pretty sure opt-enter will actually open the file if you want to open it… or cmd-O, of course