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It's especially interesting to see how fairly straightforward the fix is. I absolutely agree that open source code and hardware is absolutely necessary to provide a trustworthy hardware wallet. Knowing that there are a lot of talented people out there hacking away makes me definitely feel much safer about Trezor. Especially with SatoshiLabs' fast response time. I remember the side-channel attack that got discovered and fixed some time ago in the early days of Trezor [1]. I doubt it would have been found so quickly if Trezor wouldn't be as tinker-friendly as it is. It would have been found eventually, but probably by less well-meaning people.
[1] https://jochen-hoenicke.de/trezor-power-analysis/