Why do some language-defined attributes have @ and some not?

[Shriramana Sharma via Digitalmars-d-learn]

I thought D was beyond carrying historical baggage. DMD 2.x is not
necessarily language-compatible with DMD 2.(x+1) since the language is
still evolving. You can deprecate one syntax and enforce the other in
a later version.

I submit that the syntax for attributes should be streamlined. Shall I
go and open a Bugzilla item?

-- 
Shriramana Sharma ஶ்ரீரமணஶர்மா श्रीरमणशर्मा