I've heard so many people claim this, but I've never seen this put into practice in production, and at scale. I don't even think that that proves that this can

I've heard so many people claim this, but I've never seen this put into practice in production, and at scale. I don't even think that that proves that this cannot be done... And I've seen A LOT of people try. But, things invariably start to break down, and at this point I just think that the statement above is more wishy washy than anything, though I want to believe...