We know. Absolutely no one has ever said that your super basic webapp that has the latency requirements of "make sure it works", an SLO of "it's fine most of the time", and a code base under 10k lines of code worked on by one guy, needs these super complicated systems. Even FAANG will run internal services and dashboards on a single binary, but when every second of downtime can be translated into lost money, then you begin to care.
As for how "easy" the others are, the truth is that the options I provided will be easier to make, easier to maintain, and work better than your home grown solution once you need to account for multiple machines.
at Grafana we're now decoupling a monolith primarily so teams working on different parts can manage their own deployments/rollbacks/incidents independently of "official" monolith versions. it's a very hard/expensive refactor once you're at a scale of millions of users and hundreds of engs. but really an impossible thing to predict at inception.
You don't even need to be at FAANG-scale for this. Once you have paying customers, you care.