I'm a little skeptical of this product since it focuses on the tongue, and I'm hoping someone who has actually used it can post.
I have posted three times. I have used it in several of my own boots, including for carpet skiing at 70F
I've used it both in the pictured configuration and inside the clog.
Your mental model is wrong - the shim does bend quite nicely. I am sure there are several boot people in this thread who immediately know what boot that ^is and who would know that the stock liner tongue is rather exceptionally well padded.
It is (was) exceptionally well padded - and it still isn't padded enough to survive in the hypothetical scenario of the shim not bending that you are proposing.
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