Consuming one that is well written isn't too much pain, IME. But writing or modifying one can be really annoying. Aiui the values.yaml has no type schema, just vibes. The whole thing is powered off using text templating with yaml (a whitespace sensitive language), which is error prone and often hard to read. That's basically the main issues in a nutshell, it may not sound like much, but helm doesn't exactly do a whole lot and it does that limited set of stuff poorly.