Suppose, we define user macro {$UPSNAME} at template level and use it in Item description(name) created for this template. In list of Items for this is template the macro is not expanded. Macro $1 also not expanded. This is bad.
If macro {$UPSNAME} is defined at global level, then it expanded in Item description at template level - this is right.

Macro {$UPSNAME} and $1 in trigger name is not expanded in all Configuration menu (except tool-tip with trigger list), even the macro {$UPSNAME} is defined at host level, although ZBX-2681 now is closed.
picture as proof
related, but other issue ZBX-2924