Yeah, most people don't keep track of what features are "legitimate/standard" and which are not. It's even more problematic because some influential figures in

Yeah, most people don't keep track of what features are "legitimate/standard" and which are not. It's even more problematic because some influential figures in the community push those non-standard features and encourage people to use them. Some are pretty harmless (object spread back when it wasn't standard), some are PROBABLY okay (class field declaration, pushed very hard in the React community because the ES6 class syntax with React kind of suck without it and they pushed THAT too early). Some, however, are downright dangerous, such as decorators (pushed pretty hard in the MobX world) or bind operator (used to be pushed in the RxJS community, though not as much lately with pipeable operators). Those things are not standard, and in the case of decorators, the version being pushed doesn't even match the latest proposal. These are the stuff of tech debt nightmare when used at scale. Yet most people using them have no idea what kind of hole they're digging themselves into, and it's hard to blame them. Can't really keep track of all of that when you have deadlines to meet.