Don't presume that you're operating with sufficient domain knowledge to make those judgements, and don't presume that the folks that are making those judgements

Don't presume that you're operating with sufficient domain knowledge to make those judgements, and don't presume that the folks that are making those judgements are ignorant of the options and alternatives. When you're operating at the juggernaught-scale of business or with industrial-scale production, the rules and the requirements and the competitive landscapes are different. And the risks can come not from the existing environments - which generally work - but from making the changes to the environment, and from the risks of outages and downtime. Every vendor that can make even a tangental case for a platform or application or process migration or update or new hardware is also certainly pressing that, too; that's an automatic education for the folks involved. If you can't process customer orders for a week or a month or can't ship orders or your outage slags a whole production line, you could well end up out of business. I know of places that have had similar meltdowns during updates and during migrations, and it's Not Pretty.