I recall the property passing model being a nasty abstraction breaker. HTML attributes are all strings, so if you wanted to pass objects or functions to children you had to do that via “props” instead of “attributes.”
I also recall the tag names of web components being a pain. Always need a dash, always need to be registered.
None of these problems broke it; they just made it irritating by comparison. There wasn’t really much upside either. No real performance gain or superior feature, and you got fewer features and a smaller ecosystem.
