@property needed or not needed?

[Adam D. Ruppe]

Just a quick thought... it's not like a = 10 has no way to 
trigger a function anyway.

opAssign does it. Is that evil? This discussion kinda reminds me 
of some of the C++ arguments over operator overloading. They 
argue overloaded operators are evil because they don't look like 
function calls... but I think most of us agree that is generally 
useful.

D's properties of course aren't exactly the same but I think 
there's some similarities there that matter.