I do not "worry about a battery pack failure" because I HAVE had a battery failure that cost me a KingCat that was an old friend.
That same scenario should not happen again because I now use parallel batteries, switches and regulators. If one of them goes belly up, the other one is there to do the job.
If you want to rely on a single battery (regardless of the chemistry), go ahead. Redundant power makes sense to me.