> I don't see how you solve this with microservices.

I don't think I implied that microservices are the solution, really. You can have a replicated monolith, but that absolutely adds complexity of its own.

> But sure let's make our app 100 times more complicated because maybe some time in the next 10 years the complexity might save us an hour of downtime.

Adding replicas and load balancing doesn't have to be a hundred times more complex.

> I'd say it's more likely the added complexity will cause more downtime than it saves.

As I said before, this is an assessment you will need to make for your use case, and balance uptime requirements against your complexity budget; either answer is valid, as long as you feel confident with it. Only a Sith believes in absolutes.