The trend I've seen in big tech is that microservices architectures kind of negate a lot of this benefit though. Yes, there might be SRE's who are on-call for e

The trend I've seen in big tech is that microservices architectures kind of negate a lot of this benefit though. Yes, there might be SRE's who are on-call for existential company-wide outages, and ideally they have some general knowledge about some of the biggest systems and common causes of issues. But for any issues that are due to bugs in the code or configuration of one particular service (which is usually most issues), there is a separate on-call rotation for each service. These folks are mostly just regular engineers that are primarily responsible for building features and delivering under time pressure and don't have the luxury of a lot of training & practice dealing with incidents until they happen for real.