The calculations necessary to rebuild a failed drive from parity data stored on the other drives means that for the duration of the time that the array is being rebuilt (aka “resilvered”), you’ll have high activity on the other drives. So during that time there’s an increased chance that a drive that was already on the brink of failure is pushed over the edge. If that happens, your data is gone. Like I said it depends on your risk tolerance. You may not feel like it’s worth it in your situation. I personally only run a raidz1. I accept the risk that entails, just as people who use raidz2 accept the increased risk that entails over raidz3. There’s no limit to the amount of redundancy you can add. The level of redundancy that’s needed is a decision that only you/your organization can make.
I’ve found that people who worry that they have bad handwriting typically have very good, legible handwriting. This is true with a lot of things actually. If you care about it, chances are you’re above average already. It’s only people who don’t care and thus you don’t hear from at all about it who are truly bad at something.