iMessage on Mac is an abominable, buggy mess

I don't understand. How is the "it just works" working in complete reverse here? Currently, I'm sending messages that show "Not delivered" but are actually making it through. Then there's the sync / ordering nightmare that I've encountered since upgrading to High Sierra where some new messages will show ON TOP of my messages. And given iMessage's massive popularity and the fact that it's a core piece of their marketing for some of their central IP, why does it feel like it's only being developed by summer interns passing the project along?