This is clearly a case of limited-brain humans thinking that something different is something bad. Also a bit of Microsoft-minded FUD here, with statements about Mac OS X's "aging code base" (huh?) and Microsoft being "way ahead" of Apple in its security-patching (huh?).
Why should a company like Apple, which has never had even a minor security incident affecting its users, follow the lead of a company like Microsoft, which defined the way to Not build a secure operating system?