Why are some Swift annotations starting with uppercase letters, some starting with lowercase letters, and some still underlined?

[lmcd (Lee M)]

I tried to provoke some discussion around this here:

Addressing the ambiguity of attributes?

Does anyone else feel a bit frustrated that any and all new things now are preceded with an '@' - with no clear way to disambiguate attributes, macros, property wrappers, result builders etc? Some things are namespaced, others are hardcoded into the compiler. Case/naming seem to vary all over the place too. It's starting to feel like a mess. I don't have a well-thought-out pitch to bring to the table - rather, I'd like to stimulate some discussion. However, something quick off the top of my hea…

There seems to be a lot of focus in documentation around naming of methods, protocols, arguments etc... but attributes are the wild west - and with each subsequent Swift release we're overloading the @ symbol with even more functionality.