Does anyone actually trust AI autocomplete in large codebases?

I’ve been working in a pretty complex monorepo lately, and using ai autocomplete for code has been more frustrating than helpful. It keeps suggesting functions or variables that don’t exist, especially across services that barely talk to each other.

I tried switching between tools, copilot, cursor, and blackbox, and while they’re all decent in isolation, none of them really understand context across modules (with maybe the possible exception of the last one). I get why these ai tools for software developers are useful, but often I spend more time correcting their suggestions than if I’d just written it myself.

now I mostly use them to rename things or generate quick helper functions, anything beyond that feels like guesswork tbh

how are you all using ai coding tools in large projects? or is it mostly just good for small, isolated pieces?