If you want to continuously deploy during high-impact periods (last time I saw her bring this up was Christmas!), that takes 100% path coverage of every system

If you want to continuously deploy during high-impact periods (last time I saw her bring this up was Christmas!), that takes 100% path coverage of every system you care about, full-scale load tests, and zero software failures demonstrated over a very long time. After decades, I haven't seen this even once. I wouldn't upgrade kernels on Friday while everyone's heading for the door, and Linus' team is better than mine or yours.