[jedberg]

If you have no cache, and your first thought is "this needs a cache", you're probably right. Chances are you need to optimize a query or storage pattern. But you're thinking like an engineer. It may be true that there is a "more correct" engineering solution, but adding a cache might be the most expedient solution.

But after you'd done all the optimizations, there is still a use case for caches. The main one being that a cache holds a hot set of data. Databases are getting better at this, and with AI in everything, latency of queries is getting swamped by waiting for the LLM, but I still see caches being important for decades to come.