XCode's assistant AI suggestions are 99% ridiculous, often don't make sense, don't compile, or have nothing to do with my project. Every once in a while it suggests a line or so that is fine. The biggest issue is I want code completion and it appends extra items that make no sense at all, requiring that I either backspace a bunch, or have to use a mouse to pick from the menu. I haven't used Copilot or one of the others, so don't know if this is normal or Apple's is just stupid.