You're down? Great, so are your competitors, your customers, and your suppliers. Head to the pub. Actually, you'll probably get more real value there, as your competitors, customers and suppliers are at that same pub. Insurance multinationals have been founded from less.
That didn't affect any OT though, so it was more just proof that 90% of work carried out via O365 adds no real value. Knowing where the planes are probably is important.
I mean yeah, that's the other thing - the Keynesian sound banker aspect. But that's more for software that you're intentionally using for your business processes. I don't think anyone was thinking about Cloudstrike being down in the first place, unless they were worried about an outage in the webpage that lists all the security certifications they have.
Yes, there could be reasons to choose a lesser-known product, but they better be really good reasons.
Because there are multiple general reasons in the other direction, and incidents like this are actually one of those reasons: they could happen with any product, but now you have a bigger community sharing heads-ups and workarounds, and vendor's incident response might also be better when the whole world is on fire, not only a couple of companies.