[jmenter]

10 year iOS developer here. I don't have any answers for you (not a compiler expert either) but yeah, auto-complete of Swift in Xcode continues to suck in a lot of different ways. It's a shame because autocomplete in Obj-C was so good for so long (I'd put it up there with VSCode/TypeScript with some caveats), and is still pretty great, but seemed to get a little worse itself when Swift showed up.

[novok]

I think it comes down to swift being a way slower performance language on the compiler side because of some bad early design decisions their compiler engineers will grumble about on twitter occasionally and xcode struggling with that fact. And apple underfunding their developer tools team that creates all of this.