Perfectly valid question and we agree that multi-vendor multisig does diminish the trust put into a single manufacturer. But when/if we ever allowed support for using other devices alongside Passport, it also requires us to become quasi support for other manufacturers. Imagine we get 60 minutes into a setup with a customer and then (insert HWW brand here) decides to throw a fit and not work as expected. We cannot guarantee the quality or experience those devices offer when going through device initialisation and then coordinating into a multisig vault setup, which is ultimately why we chose not to go down that path.