Just look at the monthly security bulletins if you want to see what the current known vulnerabilities are/were. It is not about "just having the newest thing". It's also unfair to say that it's a non-issue if you don't know someone who has been personally affected by not having an up-to-date security patch on their phone. The chances of it happening to you are definitely very low, even more-so with proper precautions, but there's no reason that your phones shouldn't be at the current security patch level ASAP just in case.