I know it’s only theoretical, but why couldn’t something be just slightly smaller?
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The best way I’ve seen it described is that a Planck length is the shortest possible distance that can *theoretically* be measured. If you were to have something smaller than a Planck length you wouldn’t be able to know it was smaller than a Planck length. From the point of view of our current understanding of the laws of physics, if something were smaller it would either not be detectable or would appear to be a Planck length.
Since it is derived from constants, if someone were to come along and prove that one of the constants is wrong, we could end up with a smaller length to replace it.
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