Did you conduct the extensive study into all the possible failure modes if we allow pilots to wear smart watches? Or cork-soled shoes?

It is appropriate to use caution and care. You are right about that. It is obstructionist to demand every possible mode of failure be used as an excuse to block progress. It is possible to use flaky hardware that will increase risk. But it isn't that hard or expensive to use reasonable care to avoid it while dramatically improving the tech. To pretend that any new tech would automatically lead to hundreds of deaths and should therefore never be considered is ridiculous on its face.