At least for me, this "HSM" makes the right trade-offs. I don't need tamper self-destruction, for example. My adversaries are either: 1) thieves of opportunity, or 2) the "world conspiracy" / nation state intelligence agencies who suddenly might decide to spy on me if the world takes a dystopian turn.

For 1) tamper-proofness is total overkill. For 2), I doubt that any civilian technology would withstand a hardware attack e.g. by the NSA. If I just look at the equipment we have at our lowly, underfunded physics laboratory - probe stations, decapping facilities, wirebonders, an expert can already defeat many older hardware countermeasures with that. And I know there are much more sophisticated techniques out there, e.g. to image chips and extract secrets. Also, a variation of the "wrench" argument: Who says that the vendors of closed HSMs have not all been just forced to place backdoors?

The biggest realistic threat to me (by probability times possible damage) is by far that I might catch a Trojan. This device provides at least partial protection, in that it makes it hard for a remote attacker to sign messages or log on in my name.