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At this rate, no method of security is secure.

The most secure computer is the one locked in a room and unplugged.

There has never been a method of security that is secure. The first thing you learn when dealing with security is there are tradeoffs between opportunity, time, money. and usability.

While I agree with the spirit of your post, there is in fact a method of security that is definitively unbreakable (if used correctly/precluding side-channelling): the one-time-pad.

But as you imply, the reason we don't use it is because the opportunity cost and hassle of using it are too high for many uses.

You proved my point by needing to exclude side-channel attacks. You also need keying material, and a way to communicate that material, for a one-time pad and that's vulnerable to a whole host of attacks.

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