> 1. Terrible performance

Performance only matters if you're doing something compute- or disk-intensive, and then only if the libraries you're using are Python all the way down. (AI programming, at least the kind that most of us do--I don't know about places like OpenAI) is generally done with Python using libraries that use some compiled language under the hood.

And in this case--a linter--performance is almost certainly never an issue.

The only thing computers do is compute and disk.

Performance only matters if you care about performance, and I do care about performance. If you don't, fine I guess.