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With a typical smart lock, the failsafe mode for the battery dying or forgetting your password is a backup key.

The failsafe mode for losing a backup key is getting a locksmith to come out and fashion you a new key.

if a locksmith can open your door, others can, too. in this rare event, i think brute force is an acceptable price to pay for the extra security.

It doesn't really matter whether a locksmith can open your door. With an angle grinder and some patience, anyone can open practically any residential door (as noted by another commenter). The question then simply becomes how expensive it will be to repair everything afterwards -- and all because the battery ran out.

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