> [...] how practically no Linux distribution actually makes use of its potential (in terms of increasing security) [...] FWIW, I double-checked with a Fedora

> [...] how practically no Linux distribution actually makes use of its potential (in terms of increasing security) [...] FWIW, I double-checked with a Fedora developer; the above statement is incorrect. Fedora uses it (Secure Boot) to enforce lock-down on the kernel and then require code signing, etc.