I'm not sure I follow, I doubt the web vs native implementation of an application makes much difference when the terminal used to access it is unavailable. A cloud based web-app is not much help if no one has a working computer and browser.
I'm not sure we're quite at the stage where a check-in agent using their personal un-managed devices to handle passenger data via a web-app is a great idea.
They might not need them, but I'd be surprised if at least some companies don't install security BS on them anyway (just like they do on Linux machines), because of compliance reasons. It can't hurt, can it? (at least that was what most IT departments thought before CrowdStrike)
I'm not sure we're quite at the stage where a check-in agent using their personal un-managed devices to handle passenger data via a web-app is a great idea.