A designer must be good at UX (processes) and UI (pure design). You make them sound like they're mediocre at UI. What's their level at UX? I know I'm mediocre

A designer must be good at UX (processes) and UI (pure design). You make them sound like they're mediocre at UI. What's their level at UX? I know I'm mediocre at producing (vs evaluating) UI, but I also know I am great at producing UX. Maybe they just ain't the right professional for your startup right now. Or maybe they should focus on UX, and you should hire someone else for UI. Again, maybe they can improve on UI if properly trained. As in a professional training course, more than as in a colleague training them on the job.