That is a very important point, and I deeply respect the DIY, stateless, and air-gapped approach (projects like SeedSigner and Krux are amazing at eliminating supply-chain risks completely).
However, my guide is aimed at making Multi-Sig accessible to the average user. Most people want to upgrade their security today without sourcing separate electronic components or flashing custom firmware on a Raspberry Pi.
A commercial 2-of-3 setup using different brands (like Ledger, Trezor, and Coldcard) is still an infinite upgrade compared to a single hardware wallet. It is almost impossible for an attacker to intercept and tamper with three different packages shipped from different countries at the exact same time.
It eliminates the single point of failure for the masses. That being said, I will definitely cover a 100% DIY and QR-based guide for advanced users in the future!
