Boomer here as well, but I'd add that trusting your own org for critical infra usually also ends in tears. Most everything in IT involves failure, including in well designed systems designed by great engineers.

I worked for a few years in an exceedingly well capitalised place which ran everything in their own data centers, money no object, with a truck parked somewhere, ready to go, with a smaller version of our critical infra. We had a serious business-stopping outage once every 18 months or so, every time for fringe reasons one only learns about when trying to run a large data center. Its convenient to blame the cloud and pretend that self-hosting in private sector was so, so great with six nines.

At this point github is barely managing one nine.