[The_Colonel]

Yes, events, async, eventual consistency, decoupling represent a difficult/complex solution for some hard problems encountered when scaling high.

But people often forget there are trade-offs to everything and if you don't have these hard problems, you're giving yourself only headaches.

My pet-peeve is "decoupling" - it's treated as holy with only benefits and no downsides. But it's actually again a level of complexity - unless you need it, tightly coupled code will be easier to write, read, debug etc.