Why event sourcing an entire system is a big mistake and considered an anti-pattern?
And what situation it's consider an anti-pattern?
Updated Question :
Still don't understand why build whole event-sourcing create big monolith? What if I use process manager is it still a monolith?
As Greg Young mentioned CQRS is not an top-tier architecture? What actually is top-tier architecture then?
What is the scope of entire system that Greg Young mentioned?
I don't see any mistake to have entire system as events. It's seem to be more consistence to use pure CQRS without mixed others concept (Except I have to).