[ahofmann]

In 20 years of hosting all kinds of web services, some of them serving over 200m requests per month, a crashing single server was twice a problem.

Dealing with over engineered bullshit, that behaved in strange ways that disrupted the service was far more often a problem.

So, yes, redundancy is something that can be left away, if you're comfortable to be responsible for fixing things at a Saturday morning.

[jijijijij]

People also tend underestimate how much compute these dedicated servers got, compared to cloud offerings, and what that feels like without 100 layers of management abstraction in-between. You are likely not going to ever choke a plenty-cored, funny-RAMed root server at a fraction of your cloud costs. This overkill resource estate can be the answer to a lot of scalability worries. It's always there, no sharing shit all.