I believe they can as long as you're able to identify a contained task that touches no more than a handful of files. Still very useful to automate some tedious work or refactoring if you ask me.
All of the PRs I ever submitted touched a handful of files in my project’s subdirectory.
Or what "yes" looks like to you? It can do all the work itself, for a 50m-file monorepo, without a human guiding it which files to look at?
If it were true then human programmers would have been considered obsoleted today. There would be exactly zero human programmers who make any money in 2025.