This is massively underselling the kind of change management processes and potential challenges of scale a deployment like this would require at large enterprises. It's never as simple as "deploy app to nodes". Approvals, maintenance windows, deployment in waves (ironic I know, given the nature of the outage in the first place). Most places I've worked would require deployment to many sets lower environment machines of different functions first, then allow time to "bake" and ensure no issues crop up after things have settled. You would NEVER just yeet out a new agent to critical production systems without extensive change management, testing, and validation. I've deployed different AV products multiple times throughout my career (including Crowdstrike). It was never simple, and almost always took months to complete.