Why should I not separate alloc and init?

Question

The normal way to initialise and allocate in Objective-C is

NSObject *someObject = [[NSObject alloc] init];

Why is the following not practised

Answer 1

Because it is less simple and more error-prone.

An allocated but not initialised object is useless, so it make sense to put allocation and initialisation in one line. If they are separated, there is more possibility for errors and bugs if the two lines are not directly after each other (perhaps after refactoring), which may lead to errors while trying to use an uninitialised object.

There simply isn't a single good reason to alloc and init in separate lines, and many reasons against it.