when is redis too much for just caching

Hey folks, I've been using Redis quite a bit for caching recently, and it's been fantastic for performance. However, I'm starting to wonder if there are scenarios where it might be overkill. Are there cases where simpler in-memory caches (like Memcached, or even application-level caches) are sufficient or even preferable? Curious to hear your experiences on when to reach for Redis and when to stick with something simpler.