Airlines don't care about privacy, security, user experience, prices... There are many things you don't have to care about when competition is low and barriers to entry are incredibly high. As an aside, turns out 9/10 decoy bombs and bladed weapons are smuggled onboard with no problems in tests. All the security theatre and voodoo rituals requiring passengers to switch off all electronic devices for no actual reasons…
Airlines aren't responsible for security. The rules are specified by the IATA and national agencies and security is either handled by a government department (e.g. TSA) or by the airport itself. Also, switching off electronic devices has nothing to do with security. The apparent reason is that it can cause issues with navigation, as was theorised after a plane crash in the 90's. Most flights these days don't even req…
https://www.law.cornell.edu/cfr/text/14/91.21
The reason that different airlines have different rules, is that their OpSpecs have different (and sometimes evolving) treatment on portable electronic devices, which is their way, as operators, of complying with § 91.21
(shared because I suspect some will find it interesting in a random-trivia sort of way, not because I'm arguing against your post)